21364232 has 16 divisors (see below), whose sum is σ = 40414140. Its totient is φ = 10587136.

The previous prime is 21364229. The next prime is 21364237. The reversal of 21364232 is 23246312.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 148996 = 4606^2 + 386^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21364198 and 21364207.

It is not an unprimeable number, because it can be changed into a prime (21364237) 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, 10913 + ... + 12720.

Almost surely, 2^21364232 is an apocalyptic number.

It is an amenable number.

21364232 is a deficient number, since it is larger than the sum of its proper divisors (19049908).

21364232 is a wasteful number, since it uses less digits than its factorization.

21364232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23752 (or 23748 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 21364232 is about 4622.1458220182. The cubic root of 21364232 is about 277.4783447647.

The spelling of 21364232 in words is "twenty-one million, three hundred sixty-four thousand, two hundred thirty-two".