21277685200655 has 32 divisors (see below), whose sum is σ = 29513638514304. Its totient is φ = 14585890738176.

The previous prime is 21277685200613. The next prime is 21277685200679. The reversal of 21277685200655 is 55600258677212.

It is a cyclic number.

It is not a de Polignac number, because 21277685200655 - 2¹⁴ = 21277685184271 is a prime.

It is a super-2 number, since 2×21277685200655² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21277685200655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131808539 + ... + 131969868.

It is an arithmetic number, because the mean of its divisors is an integer number (922301203572).

Almost surely, 2^{21277685200655} is an apocalyptic number.

21277685200655 is a deficient number, since it is larger than the sum of its proper divisors (8235953313649).

21277685200655 is a wasteful number, since it uses less digits than its factorization.

21277685200655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263778515.

The product of its (nonzero) digits is 14112000, while the sum is 56.

The spelling of 21277685200655 in words is "twenty-one trillion, two hundred seventy-seven billion, six hundred eighty-five million, two hundred thousand, six hundred fifty-five".