33005225021 has 4 divisors (see below), whose sum is σ = 33015048444. Its totient is φ = 32995401600.

The previous prime is 33005224997. The next prime is 33005225023. The reversal of 33005225021 is 12052250033.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30062704996 + 2942520025 = 173386^2 + 54245^2 .

It is a cyclic number.

It is not a de Polignac number, because 33005225021 - 2¹⁸ = 33004962877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33005225023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4906670 + ... + 4913391.

It is an arithmetic number, because the mean of its divisors is an integer number (8253762111).

Almost surely, 2^33005225021 is an apocalyptic number.

It is an amenable number.

33005225021 is a deficient number, since it is larger than the sum of its proper divisors (9823423).

33005225021 is an equidigital number, since it uses as much as digits as its factorization.

33005225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9823422.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 33005225021 its reverse (12052250033), we get a palindrome (45057475054).

The spelling of 33005225021 in words is "thirty-three billion, five million, two hundred twenty-five thousand, twenty-one".