189290991021 has 8 divisors (see below), whose sum is σ = 275332350624. Its totient is φ = 114721812720.

The previous prime is 189290991013. The next prime is 189290991067. The reversal of 189290991021 is 120199092981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189290991021 - 2³ = 189290991013 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189290996021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2868045286 + ... + 2868045351.

It is an arithmetic number, because the mean of its divisors is an integer number (34416543828).

Almost surely, 2^189290991021 is an apocalyptic number.

189290991021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189290991021 is a deficient number, since it is larger than the sum of its proper divisors (86041359603).

189290991021 is a wasteful number, since it uses less digits than its factorization.

189290991021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736090651.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 189290991021 in words is "one hundred eighty-nine billion, two hundred ninety million, nine hundred ninety-one thousand, twenty-one".