21112520000 has 280 divisors, whose sum is σ = 61521331872. Its totient is φ = 7084800000.

The previous prime is 21112519979. The next prime is 21112520003. The reversal of 21112520000 is 2521112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112520003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5718155 + ... + 5721845.

Almost surely, 2^21112520000 is an apocalyptic number.

21112520000 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 21112520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30760665936).

21112520000 is an abundant number, since it is smaller than the sum of its proper divisors (40408811872).

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

21112520000 is a wasteful number, since it uses less digits than its factorization.

21112520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The spelling of 21112520000 in words is "twenty-one billion, one hundred twelve million, five hundred twenty thousand".