21572296 has 32 divisors (see below), whose sum is σ = 42804000. Its totient is φ = 10164096.

The previous prime is 21572279. The next prime is 21572297. The reversal of 21572296 is 69227512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52540 + ... + 52948.

It is an arithmetic number, because the mean of its divisors is an integer number (1337625).

Almost surely, 2^21572296 is an apocalyptic number.

It is an amenable number.

21572296 is a deficient number, since it is larger than the sum of its proper divisors (21231704).

21572296 is a wasteful number, since it uses less digits than its factorization.

21572296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 777 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 21572296 is about 4644.5985833008. The cubic root of 21572296 is about 278.3762137272.

The spelling of 21572296 in words is "twenty-one million, five hundred seventy-two thousand, two hundred ninety-six".