21626272500 has 360 divisors, whose sum is σ = 74339828640. Its totient is φ = 4876704000.

The previous prime is 21626272489. The next prime is 21626272513. The reversal of 21626272500 is 527262612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 30502146 + ... + 30502854.

It is an arithmetic number, because the mean of its divisors is an integer number (206499524).

Almost surely, 2^21626272500 is an apocalyptic number.

21626272500 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 21626272500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37169914320).

21626272500 is an abundant number, since it is smaller than the sum of its proper divisors (52713556140).

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

21626272500 is a wasteful number, since it uses less digits than its factorization.

21626272500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21626272500 in words is "twenty-one billion, six hundred twenty-six million, two hundred seventy-two thousand, five hundred".