990021100001012 has 6 divisors (see below), whose sum is σ = 1732536925001778. Its totient is φ = 495010550000504.

The previous prime is 990021100000987. The next prime is 990021100001023. The reversal of 990021100001012 is 210100001120099.

It can be written as a sum of positive squares in only one way, i.e., 985100706506596 + 4920393494416 = 31386314^2 + 2218196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123752637500123 + ... + 123752637500130.

It is an arithmetic number, because the mean of its divisors is an integer number (288756154166963).

Almost surely, 2^{990021100001012} is an apocalyptic number.

It is an amenable number.

990021100001012 is a deficient number, since it is larger than the sum of its proper divisors (742515825000766).

990021100001012 is a wasteful number, since it uses less digits than its factorization.

990021100001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247505275000257 (or 247505275000255 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 990021100001012 in words is "nine hundred ninety trillion, twenty-one billion, one hundred million, one thousand, twelve".