33721139 has 2 divisors, whose sum is σ = 33721140. Its totient is φ = 33721138.

The previous prime is 33721133. The next prime is 33721189. The reversal of 33721139 is 93112733.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 33721139 - 2⁴ = 33721123 is a prime.

It is a super-2 number, since 2×33721139² = 2274230430914642, which contains 22 as substring.

It is a Chen prime.

It is equal to p_2073296 and since 33721139 and 2073296 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (33721133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16860569 + 16860570.

It is an arithmetic number, because the mean of its divisors is an integer number (16860570).

Almost surely, 2^33721139 is an apocalyptic number.

33721139 is a deficient number, since it is larger than the sum of its proper divisors (1).

33721139 is an equidigital number, since it uses as much as digits as its factorization.

33721139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 29.

The square root of 33721139 is about 5806.9905286646. The cubic root of 33721139 is about 323.0730599907.

The spelling of 33721139 in words is "thirty-three million, seven hundred twenty-one thousand, one hundred thirty-nine".