21622657000 has 256 divisors, whose sum is σ = 61825420800. Its totient is φ = 6909235200.

The previous prime is 21622656971. The next prime is 21622657003. The reversal of 21622657000 is 75622612.

It is not an unprimeable number, because it can be changed into a prime (21622657003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12970167 + ... + 12971833.

It is an arithmetic number, because the mean of its divisors is an integer number (241505550).

Almost surely, 2^21622657000 is an apocalyptic number.

21622657000 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 21622657000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30912710400).

21622657000 is an abundant number, since it is smaller than the sum of its proper divisors (40202763800).

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

21622657000 is a wasteful number, since it uses less digits than its factorization.

21622657000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1807 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21622657000 in words is "twenty-one billion, six hundred twenty-two million, six hundred fifty-seven thousand".