33530404021 has 2 divisors, whose sum is σ = 33530404022. Its totient is φ = 33530404020.

The previous prime is 33530404003. The next prime is 33530404051. The reversal of 33530404021 is 12040403533.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24090144100 + 9440259921 = 155210^2 + 97161^2 .

It is an emirp because it is prime and its reverse (12040403533) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33530404021 - 2⁵ = 33530403989 is a prime.

It is a super-2 number, since 2×33530404021² (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 (33530404001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16765202010 + 16765202011.

It is an arithmetic number, because the mean of its divisors is an integer number (16765202011).

Almost surely, 2^33530404021 is an apocalyptic number.

It is an amenable number.

33530404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33530404021 is an equidigital number, since it uses as much as digits as its factorization.

33530404021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 33530404021 its reverse (12040403533), we get a palindrome (45570807554).

The spelling of 33530404021 in words is "thirty-three billion, five hundred thirty million, four hundred four thousand, twenty-one".