121208025891829 has 2 divisors, whose sum is σ = 121208025891830. Its totient is φ = 121208025891828.

The previous prime is 121208025891791. The next prime is 121208025891913. The reversal of 121208025891829 is 928198520802121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86233789026225 + 34974236865604 = 9286215^2 + 5913902^2 .

It is a cyclic number.

It is not a de Polignac number, because 121208025891829 - 2³⁹ = 120658270077941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121208025892829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60604012945914 + 60604012945915.

It is an arithmetic number, because the mean of its divisors is an integer number (60604012945915).

Almost surely, 2^{121208025891829} is an apocalyptic number.

It is an amenable number.

121208025891829 is a deficient number, since it is larger than the sum of its proper divisors (1).

121208025891829 is an equidigital number, since it uses as much as digits as its factorization.

121208025891829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 58.

The spelling of 121208025891829 in words is "one hundred twenty-one trillion, two hundred eight billion, twenty-five million, eight hundred ninety-one thousand, eight hundred twenty-nine".