21002310992 has 20 divisors (see below), whose sum is σ = 43822130100. Its totient is φ = 9693374208.

The previous prime is 21002310983. The next prime is 21002311019. The reversal of 21002310992 is 29901320012.

It can be written as a sum of positive squares in 2 ways, for example, as 6944888896 + 14057422096 = 83336^2 + 118564^2 .

It is a super-3 number, since 3×21002310992³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50486117 + ... + 50486532.

It is an arithmetic number, because the mean of its divisors is an integer number (2191106505).

Almost surely, 2^21002310992 is an apocalyptic number.

It is an amenable number.

21002310992 is an abundant number, since it is smaller than the sum of its proper divisors (22819819108).

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

21002310992 is a wasteful number, since it uses less digits than its factorization.

21002310992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100972670 (or 100972664 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 21002310992 in words is "twenty-one billion, two million, three hundred ten thousand, nine hundred ninety-two".