21373660660016 has 40 divisors (see below), whose sum is σ = 47344583350944. Its totient is φ = 9156812820480.

The previous prime is 21373660660013. The next prime is 21373660660021. The reversal of 21373660660016 is 61006606637312.

It is a super-2 number, since 2×21373660660016² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21373660660013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34351355 + ... + 34968026.

Almost surely, 2^{21373660660016} is an apocalyptic number.

It is an amenable number.

21373660660016 is an abundant number, since it is smaller than the sum of its proper divisors (25970922690928).

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

21373660660016 is a wasteful number, since it uses less digits than its factorization.

21373660660016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69322149 (or 69322143 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 21373660660016 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred sixty million, six hundred sixty thousand, sixteen".