22805821 has 2 divisors, whose sum is σ = 22805822. Its totient is φ = 22805820.

The previous prime is 22805779. The next prime is 22805837. The reversal of 22805821 is 12850822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19456921 + 3348900 = 4411^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 22805821 - 2⁷ = 22805693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22805821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22805851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11402910 + 11402911.

It is an arithmetic number, because the mean of its divisors is an integer number (11402911).

Almost surely, 2^22805821 is an apocalyptic number.

It is an amenable number.

22805821 is a deficient number, since it is larger than the sum of its proper divisors (1).

22805821 is an equidigital number, since it uses as much as digits as its factorization.

22805821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 22805821 is about 4775.5440527756. The cubic root of 22805821 is about 283.5841173684.

The spelling of 22805821 in words is "twenty-two million, eight hundred five thousand, eight hundred twenty-one".