22021408 has 48 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 10483200.

The previous prime is 22021403. The next prime is 22021423. The reversal of 22021408 is 80412022.

22021408 = T₂₄₇ + T₂₄₈ + ... + T₅₂₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021403) 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, 78228 + ... + 78508.

It is an arithmetic number, because the mean of its divisors is an integer number (947520).

Almost surely, 2^22021408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22021408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22740480).

22021408 is an abundant number, since it is smaller than the sum of its proper divisors (23459552).

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

22021408 is a wasteful number, since it uses less digits than its factorization.

22021408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 22021408 is about 4692.6973053884. The cubic root of 22021408 is about 280.2947915674.

The spelling of 22021408 in words is "twenty-two million, twenty-one thousand, four hundred eight".