33216060721 has 2 divisors, whose sum is σ = 33216060722. Its totient is φ = 33216060720.

The previous prime is 33216060697. The next prime is 33216060733. The reversal of 33216060721 is 12706061233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28016064400 + 5199996321 = 167380^2 + 72111^2 .

It is a cyclic number.

It is not a de Polignac number, because 33216060721 - 2²¹ = 33213963569 is a prime.

It is a super-2 number, since 2×33216060721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33216061721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16608030360 + 16608030361.

It is an arithmetic number, because the mean of its divisors is an integer number (16608030361).

Almost surely, 2^33216060721 is an apocalyptic number.

It is an amenable number.

33216060721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33216060721 is an equidigital number, since it uses as much as digits as its factorization.

33216060721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 33216060721 in words is "thirty-three billion, two hundred sixteen million, sixty thousand, seven hundred twenty-one".