22456821 has 8 divisors (see below), whose sum is σ = 29970304. Its totient is φ = 14957280.

The previous prime is 22456787. The next prime is 22456831. The reversal of 22456821 is 12865422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22456821 - 2¹⁴ = 22440437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22456831) 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, 1161 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (3746288).

Almost surely, 2^22456821 is an apocalyptic number.

It is an amenable number.

22456821 is a deficient number, since it is larger than the sum of its proper divisors (7513483).

22456821 is a wasteful number, since it uses less digits than its factorization.

22456821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6971.

The product of its digits is 7680, while the sum is 30.

The square root of 22456821 is about 4738.8628382767. The cubic root of 22456821 is about 282.1301019314.

The spelling of 22456821 in words is "twenty-two million, four hundred fifty-six thousand, eight hundred twenty-one".