21292072 has 16 divisors (see below), whose sum is σ = 39986100. Its totient is φ = 10629120.

The previous prime is 21292067. The next prime is 21292091. The reversal of 21292072 is 27029212.

It can be written as a sum of positive squares in 2 ways, for example, as 20304036 + 988036 = 4506^2 + 994^2 .

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, 4422 + ... + 7882.

Almost surely, 2^21292072 is an apocalyptic number.

It is an amenable number.

21292072 is a deficient number, since it is larger than the sum of its proper divisors (18694028).

21292072 is a wasteful number, since it uses less digits than its factorization.

21292072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21292072 is about 4614.3333212936. Note that the first 4 decimals coincide. The cubic root of 21292072 is about 277.1655880217.

The spelling of 21292072 in words is "twenty-one million, two hundred ninety-two thousand, seventy-two".