21165306224 has 40 divisors (see below), whose sum is σ = 41126653440. Its totient is φ = 10552032000.

The previous prime is 21165306191. The next prime is 21165306233. The reversal of 21165306224 is 42260356112.

It is a congruent number.

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, 13056134 + ... + 13057754.

It is an arithmetic number, because the mean of its divisors is an integer number (1028166336).

Almost surely, 2^21165306224 is an apocalyptic number.

It is an amenable number.

21165306224 is a deficient number, since it is larger than the sum of its proper divisors (19961347216).

21165306224 is a wasteful number, since it uses less digits than its factorization.

21165306224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489 (or 3483 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21165306224 in words is "twenty-one billion, one hundred sixty-five million, three hundred six thousand, two hundred twenty-four".