33700721 has 2 divisors, whose sum is σ = 33700722. Its totient is φ = 33700720.

The previous prime is 33700703. The next prime is 33700757. The reversal of 33700721 is 12700733.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26061025 + 7639696 = 5105^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 33700721 - 2⁶ = 33700657 is a prime.

It is a super-2 number, since 2×33700721² = 2271477191839682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33700021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16850360 + 16850361.

It is an arithmetic number, because the mean of its divisors is an integer number (16850361).

Almost surely, 2^33700721 is an apocalyptic number.

It is an amenable number.

33700721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33700721 is an equidigital number, since it uses as much as digits as its factorization.

33700721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 33700721 is about 5805.2322089646. The cubic root of 33700721 is about 323.0078403909.

The spelling of 33700721 in words is "thirty-three million, seven hundred thousand, seven hundred twenty-one".