33666700021 has 2 divisors, whose sum is σ = 33666700022. Its totient is φ = 33666700020.

The previous prime is 33666699991. The next prime is 33666700031. The reversal of 33666700021 is 12000766633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32819307921 + 847392100 = 181161^2 + 29110^2 .

It is a cyclic number.

It is not a de Polignac number, because 33666700021 - 2⁹ = 33666699509 is a prime.

It is a super-3 number, since 3×33666700021³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 33666700021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33666700031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16833350010 + 16833350011.

It is an arithmetic number, because the mean of its divisors is an integer number (16833350011).

Almost surely, 2^33666700021 is an apocalyptic number.

It is an amenable number.

33666700021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33666700021 is an equidigital number, since it uses as much as digits as its factorization.

33666700021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 34.

The spelling of 33666700021 in words is "thirty-three billion, six hundred sixty-six million, seven hundred thousand, twenty-one".