33231130021 has 4 divisors (see below), whose sum is σ = 33278536044. Its totient is φ = 33183724000.

The previous prime is 33231130019. The next prime is 33231130033. The reversal of 33231130021 is 12003113233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12003113233 = 113 ⋅106222241.

It can be written as a sum of positive squares in 2 ways, for example, as 15439305025 + 17791824996 = 124255^2 + 133386^2 .

It is a cyclic number.

It is not a de Polignac number, because 33231130021 - 2¹ = 33231130019 is a prime.

It is a super-2 number, since 2×33231130021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33231130091) 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, 23701960 + ... + 23703361.

It is an arithmetic number, because the mean of its divisors is an integer number (8319634011).

Almost surely, 2^33231130021 is an apocalyptic number.

It is an amenable number.

33231130021 is a deficient number, since it is larger than the sum of its proper divisors (47406023).

33231130021 is an equidigital number, since it uses as much as digits as its factorization.

33231130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47406022.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 33231130021 its reverse (12003113233), we get a palindrome (45234243254).

The spelling of 33231130021 in words is "thirty-three billion, two hundred thirty-one million, one hundred thirty thousand, twenty-one".