121341210421 has 2 divisors, whose sum is σ = 121341210422. Its totient is φ = 121341210420.

The previous prime is 121341210337. The next prime is 121341210457. The reversal of 121341210421 is 124012143121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97788169521 + 23553040900 = 312711^2 + 153470^2 .

It is a cyclic number.

It is not a de Polignac number, because 121341210421 - 2²⁷ = 121206992693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121341210392 and 121341210401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121341210491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60670605210 + 60670605211.

It is an arithmetic number, because the mean of its divisors is an integer number (60670605211).

Almost surely, 2^121341210421 is an apocalyptic number.

It is an amenable number.

121341210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121341210421 is an equidigital number, since it uses as much as digits as its factorization.

121341210421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 121341210421 its reverse (124012143121), we get a palindrome (245353353542).

The spelling of 121341210421 in words is "one hundred twenty-one billion, three hundred forty-one million, two hundred ten thousand, four hundred twenty-one".