121635342029 has 2 divisors, whose sum is σ = 121635342030. Its totient is φ = 121635342028.

The previous prime is 121635341983. The next prime is 121635342077. The reversal of 121635342029 is 920243536121.

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., 97451981929 + 24183360100 = 312173^2 + 155510^2 .

It is a cyclic number.

It is not a de Polignac number, because 121635342029 - 2¹⁶ = 121635276493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121635341983 and 121635342001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121635342929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60817671014 + 60817671015.

It is an arithmetic number, because the mean of its divisors is an integer number (60817671015).

Almost surely, 2^121635342029 is an apocalyptic number.

It is an amenable number.

121635342029 is a deficient number, since it is larger than the sum of its proper divisors (1).

121635342029 is an equidigital number, since it uses as much as digits as its factorization.

121635342029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 121635342029 in words is "one hundred twenty-one billion, six hundred thirty-five million, three hundred forty-two thousand, twenty-nine".