33921872622721 has 2 divisors, whose sum is σ = 33921872622722. Its totient is φ = 33921872622720.

The previous prime is 33921872622653. The next prime is 33921872622731. The reversal of 33921872622721 is 12722627812933.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23236400772225 + 10685471850496 = 4820415^2 + 3268864^2 .

It is a cyclic number.

It is not a de Polignac number, because 33921872622721 - 2⁷ = 33921872622593 is a prime.

It is not a weakly prime, because it can be changed into another prime (33921872622731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16960936311360 + 16960936311361.

It is an arithmetic number, because the mean of its divisors is an integer number (16960936311361).

Almost surely, 2^{33921872622721} is an apocalyptic number.

It is an amenable number.

33921872622721 is a deficient number, since it is larger than the sum of its proper divisors (1).

33921872622721 is an equidigital number, since it uses as much as digits as its factorization.

33921872622721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The spelling of 33921872622721 in words is "thirty-three trillion, nine hundred twenty-one billion, eight hundred seventy-two million, six hundred twenty-two thousand, seven hundred twenty-one".