21122520000 has 140 divisors (see below), whose sum is σ = 69836376456. Its totient is φ = 5632640000.

The previous prime is 21122519981. The next prime is 21122520049. The reversal of 21122520000 is 2522112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31990 + ... + 208010.

Almost surely, 2^21122520000 is an apocalyptic number.

21122520000 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 21122520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34918188228).

21122520000 is an abundant number, since it is smaller than the sum of its proper divisors (48713856456).

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

21122520000 is an equidigital number, since it uses as much as digits as its factorization.

21122520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176056 (or 176031 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The spelling of 21122520000 in words is "twenty-one billion, one hundred twenty-two million, five hundred twenty thousand".