33211921 has 2 divisors, whose sum is σ = 33211922. Its totient is φ = 33211920.

The previous prime is 33211901. The next prime is 33211949. The reversal of 33211921 is 12911233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 6431296 = 5175^2 + 2536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33211921 is a prime.

It is a super-2 number, since 2×33211921² = 2206063393020482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33211892 and 33211901.

It is not a weakly prime, because it can be changed into another prime (33211901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16605960 + 16605961.

It is an arithmetic number, because the mean of its divisors is an integer number (16605961).

Almost surely, 2^33211921 is an apocalyptic number.

It is an amenable number.

33211921 is a deficient number, since it is larger than the sum of its proper divisors (1).

33211921 is an equidigital number, since it uses as much as digits as its factorization.

33211921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 33211921 is about 5762.9784833886. The cubic root of 33211921 is about 321.4385784351.

The spelling of 33211921 in words is "thirty-three million, two hundred eleven thousand, nine hundred twenty-one".