121343231221 has 2 divisors, whose sum is σ = 121343231222. Its totient is φ = 121343231220.

The previous prime is 121343231213. The next prime is 121343231281. The reversal of 121343231221 is 122132343121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120071952196 + 1271279025 = 346514^2 + 35655^2 .

It is a cyclic number.

It is not a de Polignac number, because 121343231221 - 2³ = 121343231213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121343231281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60671615610 + 60671615611.

It is an arithmetic number, because the mean of its divisors is an integer number (60671615611).

Almost surely, 2^121343231221 is an apocalyptic number.

It is an amenable number.

121343231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121343231221 is an equidigital number, since it uses as much as digits as its factorization.

121343231221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

Adding to 121343231221 its reverse (122132343121), we get a palindrome (243475574342).

The spelling of 121343231221 in words is "one hundred twenty-one billion, three hundred forty-three million, two hundred thirty-one thousand, two hundred twenty-one".