21625100660 has 48 divisors (see below), whose sum is σ = 46767753984. Its totient is φ = 8393217408.

The previous prime is 21625100659. The next prime is 21625100663. The reversal of 21625100660 is 6600152612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625100663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231767 + ... + 311393.

It is an arithmetic number, because the mean of its divisors is an integer number (974328208).

Almost surely, 2^21625100660 is an apocalyptic number.

21625100660 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 21625100660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23383876992).

21625100660 is an abundant number, since it is smaller than the sum of its proper divisors (25142653324).

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

21625100660 is a wasteful number, since it uses less digits than its factorization.

21625100660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80040 (or 80038 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21625100660 in words is "twenty-one billion, six hundred twenty-five million, one hundred thousand, six hundred sixty".