33321020021 has 2 divisors, whose sum is σ = 33321020022. Its totient is φ = 33321020020.

The previous prime is 33321019993. The next prime is 33321020077. The reversal of 33321020021 is 12002012333.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28094452996 + 5226567025 = 167614^2 + 72295^2 .

It is an emirp because it is prime and its reverse (12002012333) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33321020021 - 2¹⁴ = 33321003637 is a prime.

It is a super-2 number, since 2×33321020021² (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 (33321070021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16660510010 + 16660510011.

It is an arithmetic number, because the mean of its divisors is an integer number (16660510011).

Almost surely, 2^33321020021 is an apocalyptic number.

It is an amenable number.

33321020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33321020021 is an equidigital number, since it uses as much as digits as its factorization.

33321020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 33321020021 its reverse (12002012333), we get a palindrome (45323032354).

The spelling of 33321020021 in words is "thirty-three billion, three hundred twenty-one million, twenty thousand, twenty-one".