21622880 has 48 divisors (see below), whose sum is σ = 51483600. Its totient is φ = 8581632.

The previous prime is 21622873. The next prime is 21622883. The reversal of 21622880 is 8822612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23387 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (1072575).

Almost surely, 2^21622880 is an apocalyptic number.

21622880 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 21622880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25741800).

21622880 is an abundant number, since it is smaller than the sum of its proper divisors (29860720).

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

21622880 is a wasteful number, since it uses less digits than its factorization.

21622880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 21622880 is about 4650.0408600355. The cubic root of 21622880 is about 278.5936282362.

The spelling of 21622880 in words is "twenty-one million, six hundred twenty-two thousand, eight hundred eighty".