22921257 has 4 divisors (see below), whose sum is σ = 30561680. Its totient is φ = 15280836.

The previous prime is 22921247. The next prime is 22921267. The reversal of 22921257 is 75212922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (22921247) and next prime (22921267).

It is not a de Polignac number, because 22921257 - 2¹¹ = 22919209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22921247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3820207 + ... + 3820212.

It is an arithmetic number, because the mean of its divisors is an integer number (7640420).

Almost surely, 2^22921257 is an apocalyptic number.

It is an amenable number.

22921257 is a deficient number, since it is larger than the sum of its proper divisors (7640423).

22921257 is an equidigital number, since it uses as much as digits as its factorization.

22921257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640422.

The product of its digits is 5040, while the sum is 30.

The square root of 22921257 is about 4787.6149594553. The cubic root of 22921257 is about 284.0617839857.

The spelling of 22921257 in words is "twenty-two million, nine hundred twenty-one thousand, two hundred fifty-seven".