21213533137068 has 36 divisors (see below), whose sum is σ = 55609138308360. Its totient is φ = 7071177712032.

The previous prime is 21213533137061. The next prime is 21213533137091. The reversal of 21213533137068 is 86073133531212.

21213533137068 is a `hidden beast` number, since 2 + 1 + 21 + 3 + 533 + 1 + 37 + 0 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21213533137061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10912310313 + ... + 10912312256.

Almost surely, 2^{21213533137068} is an apocalyptic number.

It is an amenable number.

21213533137068 is an abundant number, since it is smaller than the sum of its proper divisors (34395605171292).

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

21213533137068 is a wasteful number, since it uses less digits than its factorization.

21213533137068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21824622588 (or 21824622574 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21213533137068 in words is "twenty-one trillion, two hundred thirteen billion, five hundred thirty-three million, one hundred thirty-seven thousand, sixty-eight".