33363721 has 2 divisors, whose sum is σ = 33363722. Its totient is φ = 33363720.

The previous prime is 33363691. The next prime is 33363727. The reversal of 33363721 is 12736333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23629321 + 9734400 = 4861^2 + 3120^2 .

It is an emirp because it is prime and its reverse (12736333) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33363721 is a prime.

It is a super-2 number, since 2×33363721² = 2226275757931682, 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 33363721.

It is not a weakly prime, because it can be changed into another prime (33363727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16681860 + 16681861.

It is an arithmetic number, because the mean of its divisors is an integer number (16681861).

Almost surely, 2^33363721 is an apocalyptic number.

It is an amenable number.

33363721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33363721 is an equidigital number, since it uses as much as digits as its factorization.

33363721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 28.

The square root of 33363721 is about 5776.1337415264. The cubic root of 33363721 is about 321.9275617308.

The spelling of 33363721 in words is "thirty-three million, three hundred sixty-three thousand, seven hundred twenty-one".