21216362454136 has 8 divisors (see below), whose sum is σ = 39780679601520. Its totient is φ = 10608181227064.

The previous prime is 21216362454121. The next prime is 21216362454179. The reversal of 21216362454136 is 63145426361212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326022653376 + ... + 1326022653391.

It is an arithmetic number, because the mean of its divisors is an integer number (4972584950190).

Almost surely, 2^{21216362454136} is an apocalyptic number.

It is an amenable number.

21216362454136 is a deficient number, since it is larger than the sum of its proper divisors (18564317147384).

21216362454136 is a wasteful number, since it uses less digits than its factorization.

21216362454136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652045306773 (or 2652045306769 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 46.

The spelling of 21216362454136 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, four hundred fifty-four thousand, one hundred thirty-six".