189215430121 has 3 divisors (see below), whose sum is σ = 189215865111. Its totient is φ = 189214995132.

The previous prime is 189215430109. The next prime is 189215430137. The reversal of 189215430121 is 121034512981.

The square root of 189215430121 is 434989.

It is a perfect power (a square), and thus also a powerful number.

189215430121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121034512981 = 739 ⋅163781479.

It can be written as a sum of positive squares in only one way, i.e., 185708421721 + 3507008400 = 430939^2 + 59220^2 .

It is not a de Polignac number, because 189215430121 - 2⁷ = 189215429993 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189215430821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217495 + ... + 652483.

It is an arithmetic number, because the mean of its divisors is an integer number (63071955037).

Almost surely, 2^189215430121 is an apocalyptic number.

189215430121 is the 434989-th square number.

189215430121 is the 217495-th centered octagonal number.

It is an amenable number.

189215430121 is a deficient number, since it is larger than the sum of its proper divisors (434990).

189215430121 is an frugal number, since it uses more digits than its factorization.

189215430121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869978 (or 434989 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 189215430121 in words is "one hundred eighty-nine billion, two hundred fifteen million, four hundred thirty thousand, one hundred twenty-one".