21620542016376 has 24 divisors (see below), whose sum is σ = 58555634627880. Its totient is φ = 7206847338768.

The previous prime is 21620542016299. The next prime is 21620542016389. The reversal of 21620542016376 is 67361024502612.

21620542016376 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 0 + 5 + 4 + 2 + 0 + 1 + 637 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150142652820 + ... + 150142652963.

It is an arithmetic number, because the mean of its divisors is an integer number (2439818109495).

Almost surely, 2^{21620542016376} is an apocalyptic number.

It is an amenable number.

21620542016376 is an abundant number, since it is smaller than the sum of its proper divisors (36935092611504).

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

21620542016376 is a wasteful number, since it uses less digits than its factorization.

21620542016376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300285305795 (or 300285305788 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

Adding to 21620542016376 its reverse (67361024502612), we get a palindrome (88981566518988).

The spelling of 21620542016376 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-two million, sixteen thousand, three hundred seventy-six".