21277731376 has 40 divisors (see below), whose sum is σ = 45016650000. Its totient is φ = 9662392320.

The previous prime is 21277731373. The next prime is 21277731389. The reversal of 21277731376 is 67313777212.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21277731373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127000 + ... + 242248.

It is an arithmetic number, because the mean of its divisors is an integer number (1125416250).

Almost surely, 2^21277731376 is an apocalyptic number.

It is an amenable number.

21277731376 is an abundant number, since it is smaller than the sum of its proper divisors (23738918624).

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

21277731376 is a wasteful number, since it uses less digits than its factorization.

21277731376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116317 (or 116311 counting only the distinct ones).

The product of its digits is 518616, while the sum is 46.

The spelling of 21277731376 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred thirty-one thousand, three hundred seventy-six".