22821216 has 48 divisors (see below), whose sum is σ = 65354688. Its totient is φ = 6915200.

The previous prime is 22821203. The next prime is 22821229. The reversal of 22821216 is 61212822.

It is an interprime number because it is at equal distance from previous prime (22821203) and next prime (22821229).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9750 + ... + 11861.

It is an arithmetic number, because the mean of its divisors is an integer number (1361556).

Almost surely, 2^22821216 is an apocalyptic number.

It is an amenable number.

22821216 is an abundant number, since it is smaller than the sum of its proper divisors (42533472).

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

22821216 is a wasteful number, since it uses less digits than its factorization.

22821216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21635 (or 21627 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 22821216 is about 4777.1556390806. The cubic root of 22821216 is about 283.6479138803.

The spelling of 22821216 in words is "twenty-two million, eight hundred twenty-one thousand, two hundred sixteen".