21615600642630 has 32 divisors (see below), whose sum is σ = 52221000768768. Its totient is φ = 5725986924000.

The previous prime is 21615600642563. The next prime is 21615600642641. The reversal of 21615600642630 is 3624600651612.

It is a super-2 number, since 2×21615600642630² (a number of 27 digits) contains 22 as substring.

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, 2385823356 + ... + 2385832415.

It is an arithmetic number, because the mean of its divisors is an integer number (1631906274024).

Almost surely, 2^{21615600642630} is an apocalyptic number.

21615600642630 is an abundant number, since it is smaller than the sum of its proper divisors (30605400126138).

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

21615600642630 is a wasteful number, since it uses less digits than its factorization.

21615600642630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771655932.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 21615600642630 in words is "twenty-one trillion, six hundred fifteen billion, six hundred million, six hundred forty-two thousand, six hundred thirty".