121215303411421 has 2 divisors, whose sum is σ = 121215303411422. Its totient is φ = 121215303411420.

The previous prime is 121215303411379. The next prime is 121215303411487. The reversal of 121215303411421 is 124114303512121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100425451562500 + 20789851848921 = 10021250^2 + 4559589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121215303411421 is a prime.

It is a super-2 number, since 2×121215303411421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121215303411821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60607651705710 + 60607651705711.

It is an arithmetic number, because the mean of its divisors is an integer number (60607651705711).

Almost surely, 2^{121215303411421} is an apocalyptic number.

It is an amenable number.

121215303411421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121215303411421 is an equidigital number, since it uses as much as digits as its factorization.

121215303411421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 121215303411421 its reverse (124114303512121), we get a palindrome (245329606923542).

The spelling of 121215303411421 in words is "one hundred twenty-one trillion, two hundred fifteen billion, three hundred three million, four hundred eleven thousand, four hundred twenty-one".