121220012129 has 2 divisors, whose sum is σ = 121220012130. Its totient is φ = 121220012128.

The previous prime is 121220012113. The next prime is 121220012197. The reversal of 121220012129 is 921210022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61925327104 + 59294685025 = 248848^2 + 243505^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220012129 - 2⁴ = 121220012113 is a prime.

It is a super-2 number, since 2×121220012129² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121220012029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610006064 + 60610006065.

It is an arithmetic number, because the mean of its divisors is an integer number (60610006065).

Almost surely, 2^121220012129 is an apocalyptic number.

It is an amenable number.

121220012129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220012129 is an equidigital number, since it uses as much as digits as its factorization.

121220012129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 121220012129 in words is "one hundred twenty-one billion, two hundred twenty million, twelve thousand, one hundred twenty-nine".