22840921 has 2 divisors, whose sum is σ = 22840922. Its totient is φ = 22840920.

The previous prime is 22840891. The next prime is 22840927. The reversal of 22840921 is 12904822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 373321 = 4740^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 22840921 - 2⁵ = 22840889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22840921.

It is not a weakly prime, because it can be changed into another prime (22840927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11420460 + 11420461.

It is an arithmetic number, because the mean of its divisors is an integer number (11420461).

Almost surely, 2^22840921 is an apocalyptic number.

It is an amenable number.

22840921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22840921 is an equidigital number, since it uses as much as digits as its factorization.

22840921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 22840921 is about 4779.2176137941. The cubic root of 22840921 is about 283.7295290788.

The spelling of 22840921 in words is "twenty-two million, eight hundred forty thousand, nine hundred twenty-one".