33221137 has 2 divisors, whose sum is σ = 33221138. Its totient is φ = 33221136.

The previous prime is 33221093. The next prime is 33221161. The reversal of 33221137 is 73112233.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 9054081 = 4916^2 + 3009^2 .

It is an emirp because it is prime and its reverse (73112233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33221137 - 2¹¹ = 33219089 is a prime.

It is a super-2 number, since 2×33221137² = 2207287887145538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33221197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610568 + 16610569.

It is an arithmetic number, because the mean of its divisors is an integer number (16610569).

Almost surely, 2^33221137 is an apocalyptic number.

It is an amenable number.

33221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

33221137 is an equidigital number, since it uses as much as digits as its factorization.

33221137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 22.

The square root of 33221137 is about 5763.7780144624. The cubic root of 33221137 is about 321.4683077600.

The spelling of 33221137 in words is "thirty-three million, two hundred twenty-one thousand, one hundred thirty-seven".