21601624504377 has 4 divisors (see below), whose sum is σ = 28802166005840. Its totient is φ = 14401083002916.

The previous prime is 21601624504363. The next prime is 21601624504387. The reversal of 21601624504377 is 77340542610612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21601624504377 - 2¹⁰ = 21601624503353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21601624504387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600270750727 + ... + 3600270750732.

It is an arithmetic number, because the mean of its divisors is an integer number (7200541501460).

Almost surely, 2^{21601624504377} is an apocalyptic number.

It is an amenable number.

21601624504377 is a deficient number, since it is larger than the sum of its proper divisors (7200541501463).

21601624504377 is an equidigital number, since it uses as much as digits as its factorization.

21601624504377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200541501462.

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 21601624504377 in words is "twenty-one trillion, six hundred one billion, six hundred twenty-four million, five hundred four thousand, three hundred seventy-seven".