21465212 has 36 divisors (see below), whose sum is σ = 40846680. Its totient is φ = 9839232.

The previous prime is 21465209. The next prime is 21465221. The reversal of 21465212 is 21256412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294008 + ... + 294080.

It is an arithmetic number, because the mean of its divisors is an integer number (1134630).

Almost surely, 2^21465212 is an apocalyptic number.

It is an amenable number.

21465212 is a deficient number, since it is larger than the sum of its proper divisors (19381468).

21465212 is a wasteful number, since it uses less digits than its factorization.

21465212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 147 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 21465212 is about 4633.0564425657. The cubic root of 21465212 is about 277.9148333908.

The spelling of 21465212 in words is "twenty-one million, four hundred sixty-five thousand, two hundred twelve".