21216015342450 has 72 divisors (see below), whose sum is σ = 57026962207488. Its totient is φ = 5654963795040.

The previous prime is 21216015342443. The next prime is 21216015342497. The reversal of 21216015342450 is 5424351061212.

21216015342450 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 601 + 5 + 3 + 4 + 2 + 45 + 0 = 666.

It is a super-2 number, since 2×21216015342450² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10035814 + ... + 11964513.

Almost surely, 2^{21216015342450} is an apocalyptic number.

21216015342450 is an abundant number, since it is smaller than the sum of its proper divisors (35810946865038).

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

21216015342450 is a wasteful number, since it uses less digits than its factorization.

21216015342450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22002488 (or 22002480 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 21216015342450 in words is "twenty-one trillion, two hundred sixteen billion, fifteen million, three hundred forty-two thousand, four hundred fifty".