21621361434634 has 16 divisors (see below), whose sum is σ = 34937212746240. Its totient is φ = 9976119001200.

The previous prime is 21621361434593. The next prime is 21621361434679. The reversal of 21621361434634 is 43643416312612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123698142 + ... + 123872809.

It is an arithmetic number, because the mean of its divisors is an integer number (2183575796640).

Almost surely, 2^{21621361434634} is an apocalyptic number.

21621361434634 is a deficient number, since it is larger than the sum of its proper divisors (13315851311606).

21621361434634 is a wasteful number, since it uses less digits than its factorization.

21621361434634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247574325.

The product of its digits is 1492992, while the sum is 46.

The spelling of 21621361434634 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred sixty-one million, four hundred thirty-four thousand, six hundred thirty-four".