33421320173 has 2 divisors, whose sum is σ = 33421320174. Its totient is φ = 33421320172.

The previous prime is 33421320113. The next prime is 33421320197. The reversal of 33421320173 is 37102312433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31717116649 + 1704203524 = 178093^2 + 41282^2 .

It is an emirp because it is prime and its reverse (37102312433) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33421320173 - 2³² = 29126352877 is a prime.

It is a super-2 number, since 2×33421320173² (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 (33421320113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710660086 + 16710660087.

It is an arithmetic number, because the mean of its divisors is an integer number (16710660087).

Almost surely, 2^33421320173 is an apocalyptic number.

It is an amenable number.

33421320173 is a deficient number, since it is larger than the sum of its proper divisors (1).

33421320173 is an equidigital number, since it uses as much as digits as its factorization.

33421320173 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 29.

The spelling of 33421320173 in words is "thirty-three billion, four hundred twenty-one million, three hundred twenty thousand, one hundred seventy-three".