22861821 has 16 divisors (see below), whose sum is σ = 32569344. Its totient is φ = 14214144.

The previous prime is 22861789. The next prime is 22861829. The reversal of 22861821 is 12816822.

It is not a de Polignac number, because 22861821 - 2⁵ = 22861789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22861829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3780 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^22861821 is an apocalyptic number.

It is an amenable number.

22861821 is a deficient number, since it is larger than the sum of its proper divisors (9707523).

22861821 is a wasteful number, since it uses less digits than its factorization.

22861821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100.

The product of its digits is 3072, while the sum is 30.

The square root of 22861821 is about 4781.4036641974. The cubic root of 22861821 is about 283.8160425107.

The spelling of 22861821 in words is "twenty-two million, eight hundred sixty-one thousand, eight hundred twenty-one".