33217974821 has 2 divisors, whose sum is σ = 33217974822. Its totient is φ = 33217974820.

The previous prime is 33217974767. The next prime is 33217974833. The reversal of 33217974821 is 12847971233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27451850596 + 5766124225 = 165686^2 + 75935^2 .

It is a cyclic number.

It is not a de Polignac number, because 33217974821 - 2¹⁴ = 33217958437 is a prime.

It is a super-2 number, since 2×33217974821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33217974851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16608987410 + 16608987411.

It is an arithmetic number, because the mean of its divisors is an integer number (16608987411).

Almost surely, 2^33217974821 is an apocalyptic number.

It is an amenable number.

33217974821 is a deficient number, since it is larger than the sum of its proper divisors (1).

33217974821 is an equidigital number, since it uses as much as digits as its factorization.

33217974821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The spelling of 33217974821 in words is "thirty-three billion, two hundred seventeen million, nine hundred seventy-four thousand, eight hundred twenty-one".