21073772 has 12 divisors (see below), whose sum is σ = 37043160. Its totient is φ = 10490016.

The previous prime is 21073739. The next prime is 21073799. The reversal of 21073772 is 27737012.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 10697 + ... + 12512.

It is an arithmetic number, because the mean of its divisors is an integer number (3086930).

Almost surely, 2^21073772 is an apocalyptic number.

It is an amenable number.

21073772 is a deficient number, since it is larger than the sum of its proper divisors (15969388).

21073772 is a wasteful number, since it uses less digits than its factorization.

21073772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23440 (or 23438 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 21073772 is about 4590.6178233436. The cubic root of 21073772 is about 276.2151057118.

The spelling of 21073772 in words is "twenty-one million, seventy-three thousand, seven hundred seventy-two".