21598872900 has 144 divisors (see below), whose sum is σ = 68227799808. Its totient is φ = 5231952000.

The previous prime is 21598872887. The next prime is 21598872901. The reversal of 21598872900 is 927889512.

It is a super-2 number, since 2×21598872900² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21598872901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7268415 + ... + 7271385.

Almost surely, 2^21598872900 is an apocalyptic number.

21598872900 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 21598872900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34113899904).

21598872900 is an abundant number, since it is smaller than the sum of its proper divisors (46628926908).

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

21598872900 is a wasteful number, since it uses less digits than its factorization.

21598872900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5202 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

It can be divided in two parts, 21598 and 872900, that added together give a palindrome (894498).

The spelling of 21598872900 in words is "twenty-one billion, five hundred ninety-eight million, eight hundred seventy-two thousand, nine hundred".