21872886588 has 72 divisors (see below), whose sum is σ = 63287384160. Its totient is φ = 6239600640.

The previous prime is 21872886551. The next prime is 21872886661. The reversal of 21872886588 is 88568827812.

21872886588 is a `hidden beast` number, since 21 + 8 + 7 + 28 + 8 + 6 + 588 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 93828 + ... + 229236.

Almost surely, 2^21872886588 is an apocalyptic number.

21872886588 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21872886588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31643692080).

21872886588 is an abundant number, since it is smaller than the sum of its proper divisors (41414497572).

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

21872886588 is a wasteful number, since it uses less digits than its factorization.

21872886588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136067 (or 136062 counting only the distinct ones).

The product of its digits is 27525120, while the sum is 63.

The spelling of 21872886588 in words is "twenty-one billion, eight hundred seventy-two million, eight hundred eighty-six thousand, five hundred eighty-eight".