121431221393 has 2 divisors, whose sum is σ = 121431221394. Its totient is φ = 121431221392.

The previous prime is 121431221381. The next prime is 121431221449. The reversal of 121431221393 is 393122134121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117939356929 + 3491864464 = 343423^2 + 59092^2 .

It is a cyclic number.

It is not a de Polignac number, because 121431221393 - 2²⁰ = 121430172817 is a prime.

It is not a weakly prime, because it can be changed into another prime (121431221693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715610696 + 60715610697.

It is an arithmetic number, because the mean of its divisors is an integer number (60715610697).

Almost surely, 2^121431221393 is an apocalyptic number.

It is an amenable number.

121431221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

121431221393 is an equidigital number, since it uses as much as digits as its factorization.

121431221393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The spelling of 121431221393 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred ninety-three".