33902420921 has 2 divisors, whose sum is σ = 33902420922. Its totient is φ = 33902420920.

The previous prime is 33902420891. The next prime is 33902420941. The reversal of 33902420921 is 12902420933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25547546896 + 8354874025 = 159836^2 + 91405^2 .

It is a cyclic number.

It is not a de Polignac number, because 33902420921 - 2⁶ = 33902420857 is a prime.

It is a super-2 number, since 2×33902420921² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (33902420941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16951210460 + 16951210461.

It is an arithmetic number, because the mean of its divisors is an integer number (16951210461).

Almost surely, 2^33902420921 is an apocalyptic number.

It is an amenable number.

33902420921 is a deficient number, since it is larger than the sum of its proper divisors (1).

33902420921 is an equidigital number, since it uses as much as digits as its factorization.

33902420921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 33902420921 in words is "thirty-three billion, nine hundred two million, four hundred twenty thousand, nine hundred twenty-one".