21677207388 has 24 divisors (see below), whose sum is σ = 53242264320. Its totient is φ = 6845433840.

The previous prime is 21677207381. The next prime is 21677207423. The reversal of 21677207388 is 88370277612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21677207388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677207381) 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 7 ways as a sum of consecutive naturals, for example, 47537508 + ... + 47537963.

It is an arithmetic number, because the mean of its divisors is an integer number (2218427680).

Almost surely, 2^21677207388 is an apocalyptic number.

It is an amenable number.

21677207388 is an abundant number, since it is smaller than the sum of its proper divisors (31565056932).

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

21677207388 is a wasteful number, since it uses less digits than its factorization.

21677207388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95075497 (or 95075495 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 21677207388 in words is "twenty-one billion, six hundred seventy-seven million, two hundred seven thousand, three hundred eighty-eight".