21772292 has 24 divisors (see below), whose sum is σ = 39900672. Its totient is φ = 10382400.

The previous prime is 21772259. The next prime is 21772313. The reversal of 21772292 is 29227712.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7568 + ... + 10040.

It is an arithmetic number, because the mean of its divisors is an integer number (1662528).

Almost surely, 2^21772292 is an apocalyptic number.

It is an amenable number.

21772292 is a deficient number, since it is larger than the sum of its proper divisors (18128380).

21772292 is a wasteful number, since it uses less digits than its factorization.

21772292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579 (or 2577 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 21772292 is about 4666.0788677432. The cubic root of 21772292 is about 279.2338408583.

The spelling of 21772292 in words is "twenty-one million, seven hundred seventy-two thousand, two hundred ninety-two".