21235996 has 12 divisors (see below), whose sum is σ = 39119080. Its totient is φ = 10059120.

The previous prime is 21235993. The next prime is 21235997. The reversal of 21235996 is 69953212.

It is a super-2 number, since 2×21235996² = 901935052224032, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139635 + ... + 139786.

Almost surely, 2^21235996 is an apocalyptic number.

It is an amenable number.

21235996 is a deficient number, since it is larger than the sum of its proper divisors (17883084).

21235996 is a wasteful number, since it uses less digits than its factorization.

21235996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279444 (or 279442 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 21235996 is about 4608.2530312473. The cubic root of 21235996 is about 276.9220544676.

The spelling of 21235996 in words is "twenty-one million, two hundred thirty-five thousand, nine hundred ninety-six".