21377277312 has 64 divisors (see below), whose sum is σ = 58103981760. Its totient is φ = 6960038400.

The previous prime is 21377277301. The next prime is 21377277319.

21377277312 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377277319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630814 + ... + 663837.

It is an arithmetic number, because the mean of its divisors is an integer number (907874715).

Almost surely, 2^21377277312 is an apocalyptic number.

It is an amenable number.

21377277312 is an abundant number, since it is smaller than the sum of its proper divisors (36726704448).

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

21377277312 is a wasteful number, since it uses less digits than its factorization.

21377277312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294711 (or 1294699 counting only the distinct ones).

The product of its digits is 172872, while the sum is 42.

The spelling of 21377277312 in words is "twenty-one billion, three hundred seventy-seven million, two hundred seventy-seven thousand, three hundred twelve".