21626408260 has 48 divisors (see below), whose sum is σ = 47509814016. Its totient is φ = 8253539712.

The previous prime is 21626408189. The next prime is 21626408273. The reversal of 21626408260 is 6280462612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123409 + ... + 241831.

It is an arithmetic number, because the mean of its divisors is an integer number (989787792).

Almost surely, 2^21626408260 is an apocalyptic number.

21626408260 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 21626408260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23754907008).

21626408260 is an abundant number, since it is smaller than the sum of its proper divisors (25883405756).

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

21626408260 is a wasteful number, since it uses less digits than its factorization.

21626408260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118852 (or 118850 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21626408260 in words is "twenty-one billion, six hundred twenty-six million, four hundred eight thousand, two hundred sixty".