21772605137599 has 4 divisors (see below), whose sum is σ = 21772625797800. Its totient is φ = 21772584477400.

The previous prime is 21772605137593. The next prime is 21772605137639. The reversal of 21772605137599 is 99573150627712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21772605137599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21772605137599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772605137593) 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, 8659252 + ... + 10887049.

It is an arithmetic number, because the mean of its divisors is an integer number (5443156449450).

Almost surely, 2^{21772605137599} is an apocalyptic number.

21772605137599 is a deficient number, since it is larger than the sum of its proper divisors (20660201).

21772605137599 is a wasteful number, since it uses less digits than its factorization.

21772605137599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20660200.

The product of its (nonzero) digits is 50009400, while the sum is 64.

The spelling of 21772605137599 in words is "twenty-one trillion, seven hundred seventy-two billion, six hundred five million, one hundred thirty-seven thousand, five hundred ninety-nine".