21772936 has 16 divisors (see below), whose sum is σ = 42973200. Its totient is φ = 10313424.

The previous prime is 21772901. The next prime is 21772951. The reversal of 21772936 is 63927712.

It is a junction number, because it is equal to n+sod(n) for n = 21772895 and 21772904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71470 + ... + 71773.

It is an arithmetic number, because the mean of its divisors is an integer number (2685825).

Almost surely, 2^21772936 is an apocalyptic number.

It is an amenable number.

21772936 is a deficient number, since it is larger than the sum of its proper divisors (21200264).

21772936 is a wasteful number, since it uses less digits than its factorization.

21772936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143268 (or 143264 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 21772936 is about 4666.1478759251. The cubic root of 21772936 is about 279.2365939725.

It can be divided in two parts, 217 and 72936, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 21772936 in words is "twenty-one million, seven hundred seventy-two thousand, nine hundred thirty-six".