21715626613436 has 48 divisors (see below), whose sum is σ = 44494389653952. Its totient is φ = 9078921331200.

The previous prime is 21715626613391. The next prime is 21715626613469. The reversal of 21715626613436 is 63431662651712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12595226 + ... + 14215166.

It is an arithmetic number, because the mean of its divisors is an integer number (926966451124).

Almost surely, 2^{21715626613436} is an apocalyptic number.

It is an amenable number.

21715626613436 is an abundant number, since it is smaller than the sum of its proper divisors (22778763040516).

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

21715626613436 is a wasteful number, since it uses less digits than its factorization.

21715626613436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631670 (or 1631668 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 53.

The spelling of 21715626613436 in words is "twenty-one trillion, seven hundred fifteen billion, six hundred twenty-six million, six hundred thirteen thousand, four hundred thirty-six".