123021211129 has 2 divisors, whose sum is σ = 123021211130. Its totient is φ = 123021211128.

The previous prime is 123021211091. The next prime is 123021211147. The reversal of 123021211129 is 921112120321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122603621904 + 417589225 = 350148^2 + 20435^2 .

It is an emirp because it is prime and its reverse (921112120321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123021211129 - 2²³ = 123012822521 is a prime.

It is not a weakly prime, because it can be changed into another prime (123021211529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510605564 + 61510605565.

It is an arithmetic number, because the mean of its divisors is an integer number (61510605565).

Almost surely, 2^123021211129 is an apocalyptic number.

It is an amenable number.

123021211129 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021211129 is an equidigital number, since it uses as much as digits as its factorization.

123021211129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 123021211129 in words is "one hundred twenty-three billion, twenty-one million, two hundred eleven thousand, one hundred twenty-nine".