21214532646 has 24 divisors (see below), whose sum is σ = 45983151864. Its totient is φ = 7068690720.

The previous prime is 21214532623. The next prime is 21214532659. The reversal of 21214532646 is 64623541212.

21214532646 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 4 + 5 + 3 + 2 + 646 = 666.

It is a super-2 number, since 2×21214532646² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21214532646.

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, 188376 + ... + 279131.

It is an arithmetic number, because the mean of its divisors is an integer number (1915964661).

Almost surely, 2^21214532646 is an apocalyptic number.

21214532646 is an abundant number, since it is smaller than the sum of its proper divisors (24768619218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214532646 is a wasteful number, since it uses less digits than its factorization.

21214532646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470036 (or 470033 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 21214532646 in words is "twenty-one billion, two hundred fourteen million, five hundred thirty-two thousand, six hundred forty-six".