21527996 has 12 divisors (see below), whose sum is σ = 43056048. Its totient is φ = 9226272.

The previous prime is 21527983. The next prime is 21528011. The reversal of 21527996 is 69972512.

21527996 is an admirable number.

It is a super-2 number, since 2×21527996² = 926909223552032, 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 3 ways as a sum of consecutive naturals, for example, 384401 + ... + 384456.

It is an arithmetic number, because the mean of its divisors is an integer number (3588004).

Almost surely, 2^21527996 is an apocalyptic number.

It is an amenable number.

21527996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21527996 is a wasteful number, since it uses less digits than its factorization.

21527996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768868 (or 768866 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 21527996 is about 4639.8271519530. The cubic root of 21527996 is about 278.1855290723.

The spelling of 21527996 in words is "twenty-one million, five hundred twenty-seven thousand, nine hundred ninety-six".