21377697588 has 144 divisors (see below), whose sum is σ = 60434483200. Its totient is φ = 6364837440.

The previous prime is 21377697581. The next prime is 21377697611. The reversal of 21377697588 is 88579677312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377697581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2447493 + ... + 2456211.

Almost surely, 2^21377697588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377697588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30217241600).

21377697588 is an abundant number, since it is smaller than the sum of its proper divisors (39056785612).

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

21377697588 is a wasteful number, since it uses less digits than its factorization.

21377697588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8799 (or 8768 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

It can be divided in two parts, 213776 and 97588, that added together give a square (311364 = 558²).

The spelling of 21377697588 in words is "twenty-one billion, three hundred seventy-seven million, six hundred ninety-seven thousand, five hundred eighty-eight".