121431221449 has 2 divisors, whose sum is σ = 121431221450. Its totient is φ = 121431221448.

The previous prime is 121431221393. The next prime is 121431221479. The reversal of 121431221449 is 944122134121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118951181449 + 2480040000 = 344893^2 + 49800^2 .

It is a cyclic number.

It is not a de Polignac number, because 121431221449 - 2⁷ = 121431221321 is a prime.

It is a super-3 number, since 3×121431221449³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (121431221479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715610724 + 60715610725.

It is an arithmetic number, because the mean of its divisors is an integer number (60715610725).

Almost surely, 2^121431221449 is an apocalyptic number.

It is an amenable number.

121431221449 is a deficient number, since it is larger than the sum of its proper divisors (1).

121431221449 is an equidigital number, since it uses as much as digits as its factorization.

121431221449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The spelling of 121431221449 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred twenty-one thousand, four hundred forty-nine".