21368452 has 12 divisors (see below), whose sum is σ = 42736960. Its totient is φ = 9157896.

The previous prime is 21368429. The next prime is 21368453. The reversal of 21368452 is 25486312.

21368452 is an admirable number.

It is a super-2 number, since 2×21368452² = 913221481752608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21368453) 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, 381552 + ... + 381607.

Almost surely, 2^21368452 is an apocalyptic number.

It is an amenable number.

21368452 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.

21368452 is a wasteful number, since it uses less digits than its factorization.

21368452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763170 (or 763168 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21368452 is about 4622.6022974078. The cubic root of 21368452 is about 277.4966133288.

The spelling of 21368452 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred fifty-two".