99021021012 has 36 divisors (see below), whose sum is σ = 251749991220. Its totient is φ = 32816212992.

The previous prime is 99021020993. The next prime is 99021021103. The reversal of 99021021012 is 21012012099.

It can be written as a sum of positive squares in 2 ways, for example, as 63900761796 + 35120259216 = 252786^2 + 187404^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7943437 + ... + 7955892.

Almost surely, 2^99021021012 is an apocalyptic number.

It is an amenable number.

99021021012 is an abundant number, since it is smaller than the sum of its proper divisors (152728970208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99021021012 is a wasteful number, since it uses less digits than its factorization.

99021021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15899512 (or 15899507 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 99021021012 in words is "ninety-nine billion, twenty-one million, twenty-one thousand, twelve".