21988085700 has 144 divisors (see below), whose sum is σ = 72856448000. Its totient is φ = 5015537280.

The previous prime is 21988085699. The next prime is 21988085761. The reversal of 21988085700 is 758088912.

It is a self number, because there is not a number n which added to its sum of digits gives 21988085700.

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 47 ways as a sum of consecutive naturals, for example, 1037409 + ... + 1058391.

Almost surely, 2^21988085700 is an apocalyptic number.

21988085700 is a gapful number since it is divisible by the number (20) 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 21988085700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36428224000).

21988085700 is an abundant number, since it is smaller than the sum of its proper divisors (50868362300).

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

21988085700 is a wasteful number, since it uses less digits than its factorization.

21988085700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21506 (or 21499 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 21988085700 in words is "twenty-one billion, nine hundred eighty-eight million, eighty-five thousand, seven hundred".