121312331331 has 48 divisors (see below), whose sum is σ = 170809341600. Its totient is φ = 76493362176.

The previous prime is 121312331269. The next prime is 121312331333. The reversal of 121312331331 is 133133213121.

It is not a de Polignac number, because 121312331331 - 2⁶ = 121312331267 is a prime.

It is a super-2 number, since 2×121312331331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121312331333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120229755 + ... + 120230763.

It is an arithmetic number, because the mean of its divisors is an integer number (3558527950).

Almost surely, 2^121312331331 is an apocalyptic number.

121312331331 is a deficient number, since it is larger than the sum of its proper divisors (49497010269).

121312331331 is a wasteful number, since it uses less digits than its factorization.

121312331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556 (or 1497 counting only the distinct ones).

The product of its digits is 972, while the sum is 24.

Adding to 121312331331 its reverse (133133213121), we get a palindrome (254445544452).

The spelling of 121312331331 in words is "one hundred twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, three hundred thirty-one".