99412042236521 has 16 divisors (see below), whose sum is σ = 114759504297984. Its totient is φ = 84351631412304.

The previous prime is 99412042236509. The next prime is 99412042236523. The reversal of 99412042236521 is 12563224021499.

It is a cyclic number.

It is not a de Polignac number, because 99412042236521 - 2⁶ = 99412042236457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99412042236521.

It is not an unprimeable number, because it can be changed into a prime (99412042236523) 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, 23719685 + ... + 27594338.

It is an arithmetic number, because the mean of its divisors is an integer number (7172469018624).

Almost surely, 2^{99412042236521} is an apocalyptic number.

It is an amenable number.

99412042236521 is a deficient number, since it is larger than the sum of its proper divisors (15347462061463).

99412042236521 is a wasteful number, since it uses less digits than its factorization.

99412042236521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51316820.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 99412042236521 in words is "ninety-nine trillion, four hundred twelve billion, forty-two million, two hundred thirty-six thousand, five hundred twenty-one".