21265970 has 16 divisors (see below), whose sum is σ = 41758848. Its totient is φ = 7733040.

The previous prime is 21265967. The next prime is 21265999. The reversal of 21265970 is 7956212.

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, 96554 + ... + 96773.

It is an arithmetic number, because the mean of its divisors is an integer number (2609928).

Almost surely, 2^21265970 is an apocalyptic number.

21265970 is a deficient number, since it is larger than the sum of its proper divisors (20492878).

21265970 is a wasteful number, since it uses less digits than its factorization.

21265970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193345.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 21265970 is about 4611.5040930265. The cubic root of 21265970 is about 277.0522823981.

The spelling of 21265970 in words is "twenty-one million, two hundred sixty-five thousand, nine hundred seventy".