12431211217421 has 2 divisors, whose sum is σ = 12431211217422. Its totient is φ = 12431211217420.

The previous prime is 12431211217409. The next prime is 12431211217459. The reversal of 12431211217421 is 12471211213421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7744588068100 + 4686623149321 = 2782910^2 + 2164861^2 .

It is a cyclic number.

It is not a de Polignac number, because 12431211217421 - 2²² = 12431207023117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12431211217021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6215605608710 + 6215605608711.

It is an arithmetic number, because the mean of its divisors is an integer number (6215605608711).

Almost surely, 2^{12431211217421} is an apocalyptic number.

It is an amenable number.

12431211217421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431211217421 is an equidigital number, since it uses as much as digits as its factorization.

12431211217421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The spelling of 12431211217421 in words is "twelve trillion, four hundred thirty-one billion, two hundred eleven million, two hundred seventeen thousand, four hundred twenty-one".