33045212521 has 4 divisors (see below), whose sum is σ = 33049194052. Its totient is φ = 33041230992.

The previous prime is 33045212489. The next prime is 33045212531. The reversal of 33045212521 is 12521254033.

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 16094474496 + 16950738025 = 126864^2 + 130195^2 .

It is a cyclic number.

It is not a de Polignac number, because 33045212521 - 2⁵ = 33045212489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33045212521.

It is not an unprimeable number, because it can be changed into a prime (33045212531) 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, 1978290 + ... + 1994923.

It is an arithmetic number, because the mean of its divisors is an integer number (8262298513).

Almost surely, 2^33045212521 is an apocalyptic number.

It is an amenable number.

33045212521 is a deficient number, since it is larger than the sum of its proper divisors (3981531).

33045212521 is an equidigital number, since it uses as much as digits as its factorization.

33045212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981530.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 33045212521 its reverse (12521254033), we get a palindrome (45566466554).

The spelling of 33045212521 in words is "thirty-three billion, forty-five million, two hundred twelve thousand, five hundred twenty-one".