21153022256454 has 32 divisors (see below), whose sum is σ = 48581103749760. Its totient is φ = 6072637968000.

The previous prime is 21153022256447. The next prime is 21153022256507. The reversal of 21153022256454 is 45465222035112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8434218147 + ... + 8434220654.

It is an arithmetic number, because the mean of its divisors is an integer number (1518159492180).

Almost surely, 2^{21153022256454} is an apocalyptic number.

21153022256454 is an abundant number, since it is smaller than the sum of its proper divisors (27428081493306).

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

21153022256454 is a wasteful number, since it uses less digits than its factorization.

21153022256454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16868438836.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 21153022256454 in words is "twenty-one trillion, one hundred fifty-three billion, twenty-two million, two hundred fifty-six thousand, four hundred fifty-four".