21377758964 has 12 divisors (see below), whose sum is σ = 37418590944. Its totient is φ = 10686732984.

The previous prime is 21377758957. The next prime is 21377758967. The reversal of 21377758964 is 46985777312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377758967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514112 + ... + 554135.

It is an arithmetic number, because the mean of its divisors is an integer number (3118215912).

Almost surely, 2^21377758964 is an apocalyptic number.

It is an amenable number.

21377758964 is a deficient number, since it is larger than the sum of its proper divisors (16040831980).

21377758964 is a wasteful number, since it uses less digits than its factorization.

21377758964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073254 (or 1073252 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 59.

The spelling of 21377758964 in words is "twenty-one billion, three hundred seventy-seven million, seven hundred fifty-eight thousand, nine hundred sixty-four".