215430545121101 has 4 divisors (see below), whose sum is σ = 217851113043900. Its totient is φ = 213009977198304.

The previous prime is 215430545121073. The next prime is 215430545121163. The reversal of 215430545121101 is 101121545034512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38404060804201 + 177026484316900 = 6197101^2 + 13305130^2 .

It is a cyclic number.

It is not a de Polignac number, because 215430545121101 - 2²⁶ = 215430478012237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215430541121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210283961266 + ... + 1210283961443.

It is an arithmetic number, because the mean of its divisors is an integer number (54462778260975).

Almost surely, 2^{215430545121101} is an apocalyptic number.

It is an amenable number.

215430545121101 is a deficient number, since it is larger than the sum of its proper divisors (2420567922799).

215430545121101 is an equidigital number, since it uses as much as digits as its factorization.

215430545121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420567922798.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 215430545121101 in words is "two hundred fifteen trillion, four hundred thirty billion, five hundred forty-five million, one hundred twenty-one thousand, one hundred one".