21277165215 has 16 divisors (see below), whose sum is σ = 34150864608. Its totient is φ = 11312021376.

The previous prime is 21277165211. The next prime is 21277165223. The reversal of 21277165215 is 51256177212.

It is not a de Polignac number, because 21277165215 - 2² = 21277165211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277165211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2232592 + ... + 2242101.

It is an arithmetic number, because the mean of its divisors is an integer number (2134429038).

Almost surely, 2^21277165215 is an apocalyptic number.

21277165215 is a deficient number, since it is larger than the sum of its proper divisors (12873699393).

21277165215 is a wasteful number, since it uses less digits than its factorization.

21277165215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475018.

The product of its digits is 58800, while the sum is 39.

The spelling of 21277165215 in words is "twenty-one billion, two hundred seventy-seven million, one hundred sixty-five thousand, two hundred fifteen".