12121002331 has 4 divisors (see below), whose sum is σ = 12122776872. Its totient is φ = 12119227792.

The previous prime is 12121002319. The next prime is 12121002337. The reversal of 12121002331 is 13320012121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121002331 is a prime.

It is a super-2 number, since 2×12121002331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121002337) 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, 876985 + ... + 890698.

It is an arithmetic number, because the mean of its divisors is an integer number (3030694218).

Almost surely, 2^12121002331 is an apocalyptic number.

12121002331 is a deficient number, since it is larger than the sum of its proper divisors (1774541).

12121002331 is an equidigital number, since it uses as much as digits as its factorization.

12121002331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774540.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12121002331 its reverse (13320012121), we get a palindrome (25441014452).

The spelling of 12121002331 in words is "twelve billion, one hundred twenty-one million, two thousand, three hundred thirty-one".