121443134521 has 2 divisors, whose sum is σ = 121443134522. Its totient is φ = 121443134520.

The previous prime is 121443134471. The next prime is 121443134531. The reversal of 121443134521 is 125431344121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68453396496 + 52989738025 = 261636^2 + 230195^2 .

It is a cyclic number.

It is not a de Polignac number, because 121443134521 - 2⁹ = 121443134009 is a prime.

It is not a weakly prime, because it can be changed into another prime (121443134531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60721567260 + 60721567261.

It is an arithmetic number, because the mean of its divisors is an integer number (60721567261).

Almost surely, 2^121443134521 is an apocalyptic number.

It is an amenable number.

121443134521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121443134521 is an equidigital number, since it uses as much as digits as its factorization.

121443134521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

Adding to 121443134521 its reverse (125431344121), we get a palindrome (246874478642).

The spelling of 121443134521 in words is "one hundred twenty-one billion, four hundred forty-three million, one hundred thirty-four thousand, five hundred twenty-one".