21277765674 has 96 divisors (see below), whose sum is σ = 51335331840. Its totient is φ = 6315472800.

The previous prime is 21277765669. The next prime is 21277765721. The reversal of 21277765674 is 47656777212.

21277765674 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 7 + 76 + 567 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21277765674.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1981179 + ... + 1991889.

It is an arithmetic number, because the mean of its divisors is an integer number (534743040).

Almost surely, 2^21277765674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21277765674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25667665920).

21277765674 is an abundant number, since it is smaller than the sum of its proper divisors (30057566166).

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

21277765674 is a wasteful number, since it uses less digits than its factorization.

21277765674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936 (or 10933 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 54.

The spelling of 21277765674 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred sixty-five thousand, six hundred seventy-four".