121312331 has 16 divisors (see below), whose sum is σ = 146454528. Its totient is φ = 98280000.

The previous prime is 121312297. The next prime is 121312339. The reversal of 121312331 is 133213121.

It is not a de Polignac number, because 121312331 - 2¹⁴ = 121295947 is a prime.

It is a super-2 number, since 2×121312331² = 29433363305307122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2831 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (9153408).

Almost surely, 2^121312331 is an apocalyptic number.

121312331 is a deficient number, since it is larger than the sum of its proper divisors (25142197).

121312331 is a wasteful number, since it uses less digits than its factorization.

121312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13082.

The product of its digits is 108, while the sum is 17.

The square root of 121312331 is about 11014.1877140350. The cubic root of 121312331 is about 495.0339479489.

Adding to 121312331 its reverse (133213121), we get a palindrome (254525452).

The spelling of 121312331 in words is "one hundred twenty-one million, three hundred twelve thousand, three hundred thirty-one".