33221957 has 2 divisors, whose sum is σ = 33221958. Its totient is φ = 33221956.

The previous prime is 33221891. The next prime is 33221977. The reversal of 33221957 is 75912233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31013761 + 2208196 = 5569^2 + 1486^2 .

It is an emirp because it is prime and its reverse (75912233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33221957 - 2⁸ = 33221701 is a prime.

It is a super-2 number, since 2×33221957² = 2207396853819698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33221977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610978 + 16610979.

It is an arithmetic number, because the mean of its divisors is an integer number (16610979).

Almost surely, 2^33221957 is an apocalyptic number.

It is an amenable number.

33221957 is a deficient number, since it is larger than the sum of its proper divisors (1).

33221957 is an equidigital number, since it uses as much as digits as its factorization.

33221957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 33221957 is about 5763.8491479219. The cubic root of 33221957 is about 321.4709526809.

The spelling of 33221957 in words is "thirty-three million, two hundred twenty-one thousand, nine hundred fifty-seven".