21364720715154 has 32 divisors (see below), whose sum is σ = 45243200566080. Its totient is φ = 6702618578432.

The previous prime is 21364720715147. The next prime is 21364720715179. The reversal of 21364720715154 is 45151702746312.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20695057 + ... + 21702875.

It is an arithmetic number, because the mean of its divisors is an integer number (1413850017690).

Almost surely, 2^{21364720715154} is an apocalyptic number.

21364720715154 is an abundant number, since it is smaller than the sum of its proper divisors (23878479850926).

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

21364720715154 is a wasteful number, since it uses less digits than its factorization.

21364720715154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215674.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 21364720715154 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred twenty million, seven hundred fifteen thousand, one hundred fifty-four".