33444721 has 2 divisors, whose sum is σ = 33444722. Its totient is φ = 33444720.

The previous prime is 33444713. The next prime is 33444751. The reversal of 33444721 is 12744433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 7485696 = 5095^2 + 2736^2 .

It is a cyclic number.

It is not a de Polignac number, because 33444721 - 2³ = 33444713 is a prime.

It is a super-2 number, since 2×33444721² = 2237098725535682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33444721.

It is not a weakly prime, because it can be changed into another prime (33444751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16722360 + 16722361.

It is an arithmetic number, because the mean of its divisors is an integer number (16722361).

Almost surely, 2^33444721 is an apocalyptic number.

It is an amenable number.

33444721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33444721 is an equidigital number, since it uses as much as digits as its factorization.

33444721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 28.

The square root of 33444721 is about 5783.1411015122. The cubic root of 33444721 is about 322.1878750063.

The spelling of 33444721 in words is "thirty-three million, four hundred forty-four thousand, seven hundred twenty-one".