21621337676142 has 32 divisors (see below), whose sum is σ = 44671442872320. Its totient is φ = 6969337164960.

The previous prime is 21621337676077. The next prime is 21621337676149. The reversal of 21621337676142 is 24167673312612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621337676149) by changing a digit.

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, 43819773 + ... + 44310440.

It is an arithmetic number, because the mean of its divisors is an integer number (1395982589760).

Almost surely, 2^{21621337676142} is an apocalyptic number.

21621337676142 is an abundant number, since it is smaller than the sum of its proper divisors (23050105196178).

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

21621337676142 is a wasteful number, since it uses less digits than its factorization.

21621337676142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88131568.

The product of its digits is 3048192, while the sum is 51.

The spelling of 21621337676142 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-seven million, six hundred seventy-six thousand, one hundred forty-two".