21650732 has 12 divisors (see below), whose sum is σ = 38030496. Its totient is φ = 10784880.

The previous prime is 21650731. The next prime is 21650737. The reversal of 21650732 is 23705612.

It is a super-2 number, since 2×21650732² = 937508392271648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21650731) 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, 8903 + ... + 11070.

It is an arithmetic number, because the mean of its divisors is an integer number (3169208).

Almost surely, 2^21650732 is an apocalyptic number.

It is an amenable number.

21650732 is a deficient number, since it is larger than the sum of its proper divisors (16379764).

21650732 is a wasteful number, since it uses less digits than its factorization.

21650732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20248 (or 20246 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21650732 is about 4653.0347086606. The cubic root of 21650732 is about 278.7131938775.

The spelling of 21650732 in words is "twenty-one million, six hundred fifty thousand, seven hundred thirty-two".