21733672 has 8 divisors (see below), whose sum is σ = 40750650. Its totient is φ = 10866832.

The previous prime is 21733669. The next prime is 21733681. The reversal of 21733672 is 27633712.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 6320196 = 3926^2 + 2514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358347 + ... + 1358362.

Almost surely, 2^21733672 is an apocalyptic number.

It is an amenable number.

21733672 is a deficient number, since it is larger than the sum of its proper divisors (19016978).

21733672 is a wasteful number, since it uses less digits than its factorization.

21733672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716715 (or 2716711 counting only the distinct ones).

The product of its digits is 10584, while the sum is 31.

The square root of 21733672 is about 4661.9386525350. The cubic root of 21733672 is about 279.0686401604.

The spelling of 21733672 in words is "twenty-one million, seven hundred thirty-three thousand, six hundred seventy-two".