12331956421 has 2 divisors, whose sum is σ = 12331956422. Its totient is φ = 12331956420.

The previous prime is 12331956409. The next prime is 12331956431. The reversal of 12331956421 is 12465913321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7763548321 + 4568408100 = 88111^2 + 67590^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331956421 - 2²⁵ = 12298401989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331956431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165978210 + 6165978211.

It is an arithmetic number, because the mean of its divisors is an integer number (6165978211).

Almost surely, 2^12331956421 is an apocalyptic number.

It is an amenable number.

12331956421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331956421 is an equidigital number, since it uses as much as digits as its factorization.

12331956421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The spelling of 12331956421 in words is "twelve billion, three hundred thirty-one million, nine hundred fifty-six thousand, four hundred twenty-one".