21120772 has 12 divisors (see below), whose sum is σ = 37228240. Its totient is φ = 10484136.

The previous prime is 21120769. The next prime is 21120773. The reversal of 21120772 is 27702112.

It is not an unprimeable number, because it can be changed into a prime (21120773) 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, 18438 + ... + 19549.

Almost surely, 2^21120772 is an apocalyptic number.

It is an amenable number.

21120772 is a deficient number, since it is larger than the sum of its proper divisors (16107468).

21120772 is a wasteful number, since it uses less digits than its factorization.

21120772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38130 (or 38128 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21120772 is about 4595.7341089319. The cubic root of 21120772 is about 276.4202971182.

Adding to 21120772 its reverse (27702112), we get a palindrome (48822884).

The spelling of 21120772 in words is "twenty-one million, one hundred twenty thousand, seven hundred seventy-two".