21002996 has 24 divisors (see below), whose sum is σ = 43362816. Its totient is φ = 8710560.

The previous prime is 21002987. The next prime is 21003001. The reversal of 21002996 is 69920012.

It is a super-2 number, since 2×21002996² = 882251681952032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11231 + ... + 12966.

It is an arithmetic number, because the mean of its divisors is an integer number (1806784).

Almost surely, 2^21002996 is an apocalyptic number.

It is an amenable number.

21002996 is an abundant number, since it is smaller than the sum of its proper divisors (22359820).

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

21002996 is a wasteful number, since it uses less digits than its factorization.

21002996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24239 (or 24237 counting only the distinct ones).

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

The square root of 21002996 is about 4582.9025736972. The cubic root of 21002996 is about 275.9055372314.

The spelling of 21002996 in words is "twenty-one million, two thousand, nine hundred ninety-six".