121510441421 has 2 divisors, whose sum is σ = 121510441422. Its totient is φ = 121510441420.

The previous prime is 121510441363. The next prime is 121510441483. The reversal of 121510441421 is 124144015121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119397200521 + 2113240900 = 345539^2 + 45970^2 .

It is a cyclic number.

It is not a de Polignac number, because 121510441421 - 2¹⁸ = 121510179277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121510441021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60755220710 + 60755220711.

It is an arithmetic number, because the mean of its divisors is an integer number (60755220711).

Almost surely, 2^121510441421 is an apocalyptic number.

It is an amenable number.

121510441421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121510441421 is an equidigital number, since it uses as much as digits as its factorization.

121510441421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 26.

Adding to 121510441421 its reverse (124144015121), we get a palindrome (245654456542).

The spelling of 121510441421 in words is "one hundred twenty-one billion, five hundred ten million, four hundred forty-one thousand, four hundred twenty-one".