21266732 has 12 divisors (see below), whose sum is σ = 37405200. Its totient is φ = 10579536.

The previous prime is 21266731. The next prime is 21266737. The reversal of 21266732 is 23766212.

It is a junction number, because it is equal to n+sod(n) for n = 21266695 and 21266704.

It is not an unprimeable number, because it can be changed into a prime (21266731) 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, 12563 + ... + 14154.

It is an arithmetic number, because the mean of its divisors is an integer number (3117100).

Almost surely, 2^21266732 is an apocalyptic number.

It is an amenable number.

21266732 is a deficient number, since it is larger than the sum of its proper divisors (16138468).

21266732 is a wasteful number, since it uses less digits than its factorization.

21266732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26920 (or 26918 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 21266732 is about 4611.5867117512. The cubic root of 21266732 is about 277.0555914613.

The spelling of 21266732 in words is "twenty-one million, two hundred sixty-six thousand, seven hundred thirty-two".