33149021 has 2 divisors, whose sum is σ = 33149022. Its totient is φ = 33149020.

The previous prime is 33148979. The next prime is 33149023. The reversal of 33149021 is 12094133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 6996025 = 5114^2 + 2645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33149021 is a prime.

Together with 33149023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33149023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16574510 + 16574511.

It is an arithmetic number, because the mean of its divisors is an integer number (16574511).

Almost surely, 2^33149021 is an apocalyptic number.

It is an amenable number.

33149021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33149021 is an equidigital number, since it uses as much as digits as its factorization.

33149021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 33149021 is about 5757.5186495573. The cubic root of 33149021 is about 321.2355262042.

The spelling of 33149021 in words is "thirty-three million, one hundred forty-nine thousand, twenty-one".