12312011421 has 40 divisors (see below), whose sum is σ = 19046929440. Its totient is φ = 7920345888.

The previous prime is 12312011407. The next prime is 12312011449. The reversal of 12312011421 is 12411021321.

12312011421 is a `hidden beast` number, since 1 + 231 + 2 + 0 + 11 + 421 = 666.

It is not a de Polignac number, because 12312011421 - 2¹⁰ = 12312010397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12312011394 and 12312011403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312011461) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 267795 + ... + 310383.

It is an arithmetic number, because the mean of its divisors is an integer number (476173236).

Almost surely, 2^12312011421 is an apocalyptic number.

It is an amenable number.

12312011421 is a deficient number, since it is larger than the sum of its proper divisors (6734918019).

12312011421 is an equidigital number, since it uses as much as digits as its factorization.

12312011421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42727 (or 42718 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 12312011421 its reverse (12411021321), we get a palindrome (24723032742).

The spelling of 12312011421 in words is "twelve billion, three hundred twelve million, eleven thousand, four hundred twenty-one".