78902111021 has 16 divisors (see below), whose sum is σ = 83287353600. Its totient is φ = 74642568000.

The previous prime is 78902111017. The next prime is 78902111047. The reversal of 78902111021 is 12011120987.

It is a cyclic number.

It is not a de Polignac number, because 78902111021 - 2² = 78902111017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78902111051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168671 + ... + 431571.

It is an arithmetic number, because the mean of its divisors is an integer number (5205459600).

Almost surely, 2^78902111021 is an apocalyptic number.

It is an amenable number.

78902111021 is a deficient number, since it is larger than the sum of its proper divisors (4385242579).

78902111021 is a wasteful number, since it uses less digits than its factorization.

78902111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263140.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 78902111021 in words is "seventy-eight billion, nine hundred two million, one hundred eleven thousand, twenty-one".