22772821 has 2 divisors, whose sum is σ = 22772822. Its totient is φ = 22772820.

The previous prime is 22772803. The next prime is 22772833. The reversal of 22772821 is 12827722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14333796 + 8439025 = 3786^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 22772821 - 2¹¹ = 22770773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22772021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11386410 + 11386411.

It is an arithmetic number, because the mean of its divisors is an integer number (11386411).

Almost surely, 2^22772821 is an apocalyptic number.

It is an amenable number.

22772821 is a deficient number, since it is larger than the sum of its proper divisors (1).

22772821 is an equidigital number, since it uses as much as digits as its factorization.

22772821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 31.

The square root of 22772821 is about 4772.0876982721. The cubic root of 22772821 is about 283.4472693636.

The spelling of 22772821 in words is "twenty-two million, seven hundred seventy-two thousand, eight hundred twenty-one".