22821008 has 40 divisors (see below), whose sum is σ = 51907392. Its totient is φ = 9514368.

The previous prime is 22820981. The next prime is 22821017. The reversal of 22821008 is 80012822.

It is a super-2 number, since 2×22821008² = 1041596812272128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1391 + ... + 6897.

Almost surely, 2^22821008 is an apocalyptic number.

22821008 is a gapful number since it is divisible by the number (28) 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 22821008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25953696).

22821008 is an abundant number, since it is smaller than the sum of its proper divisors (29086384).

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

22821008 is a wasteful number, since it uses less digits than its factorization.

22821008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559 (or 5553 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 22821008 is about 4777.1338687544. The cubic root of 22821008 is about 283.6470521245.

The spelling of 22821008 in words is "twenty-two million, eight hundred twenty-one thousand, eight".