121431221381 has 2 divisors, whose sum is σ = 121431221382. Its totient is φ = 121431221380.

The previous prime is 121431221371. The next prime is 121431221393. The reversal of 121431221381 is 183122134121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113726770756 + 7704450625 = 337234^2 + 87775^2 .

It is a cyclic number.

It is not a de Polignac number, because 121431221381 - 2¹⁰ = 121431220357 is a prime.

It is a super-2 number, since 2×121431221381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121431221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715610690 + 60715610691.

It is an arithmetic number, because the mean of its divisors is an integer number (60715610691).

Almost surely, 2^121431221381 is an apocalyptic number.

It is an amenable number.

121431221381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121431221381 is an equidigital number, since it uses as much as digits as its factorization.

121431221381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The spelling of 121431221381 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred eighty-one".