31323432512421 has 24 divisors (see below), whose sum is σ = 51739505425920. Its totient is φ = 17888379784416.

The previous prime is 31323432512387. The next prime is 31323432512521. The reversal of 31323432512421 is 12421523432313.

31323432512421 is a `hidden beast` number, since 3 + 1 + 323 + 4 + 325 + 1 + 2 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 31323432512421 - 2⁶ = 31323432512357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323432512521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148845525 + ... + 149055818.

It is an arithmetic number, because the mean of its divisors is an integer number (2155812726080).

Almost surely, 2^{31323432512421} is an apocalyptic number.

It is an amenable number.

31323432512421 is a deficient number, since it is larger than the sum of its proper divisors (20416072913499).

31323432512421 is a wasteful number, since it uses less digits than its factorization.

31323432512421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297903025 (or 297903022 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

Adding to 31323432512421 its reverse (12421523432313), we get a palindrome (43744955944734).

The spelling of 31323432512421 in words is "thirty-one trillion, three hundred twenty-three billion, four hundred thirty-two million, five hundred twelve thousand, four hundred twenty-one".