21669936 has 40 divisors (see below), whose sum is σ = 57288000. Its totient is φ = 7054656.

The previous prime is 21669871. The next prime is 21669943. The reversal of 21669936 is 63996612.

It is a super-2 number, since 2×21669936² = 939172252488192, which contains 22 as substring.

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, 3186 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1432200).

Almost surely, 2^21669936 is an apocalyptic number.

It is an amenable number.

21669936 is an abundant number, since it is smaller than the sum of its proper divisors (35618064).

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

21669936 is a wasteful number, since it uses less digits than its factorization.

21669936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10553 (or 10547 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 21669936 is about 4655.0978507438. The cubic root of 21669936 is about 278.7955748711.

The spelling of 21669936 in words is "twenty-one million, six hundred sixty-nine thousand, nine hundred thirty-six".