21660353656134 has 16 divisors (see below), whose sum is σ = 43321873578240. Its totient is φ = 7219923507720.

The previous prime is 21660353656091. The next prime is 21660353656211. The reversal of 21660353656134 is 43165635306612.

It is a super-2 number, since 2×21660353656134² (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 7 ways as a sum of consecutive naturals, for example, 48352882 + ... + 48798789.

It is an arithmetic number, because the mean of its divisors is an integer number (2707617098640).

Almost surely, 2^{21660353656134} is an apocalyptic number.

21660353656134 is an abundant number, since it is smaller than the sum of its proper divisors (21661519922106).

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

21660353656134 is a wasteful number, since it uses less digits than its factorization.

21660353656134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97188835.

The product of its (nonzero) digits is 6998400, while the sum is 51.

The spelling of 21660353656134 in words is "twenty-one trillion, six hundred sixty billion, three hundred fifty-three million, six hundred fifty-six thousand, one hundred thirty-four".