121223513129 has 2 divisors, whose sum is σ = 121223513130. Its totient is φ = 121223513128.

The previous prime is 121223513107. The next prime is 121223513143. The reversal of 121223513129 is 921315322121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98156890000 + 23066623129 = 313300^2 + 151877^2 .

It is an emirp because it is prime and its reverse (921315322121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121223513129 - 2¹⁶ = 121223447593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121223513095 and 121223513104.

It is not a weakly prime, because it can be changed into another prime (121223513729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611756564 + 60611756565.

It is an arithmetic number, because the mean of its divisors is an integer number (60611756565).

Almost surely, 2^121223513129 is an apocalyptic number.

It is an amenable number.

121223513129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121223513129 is an equidigital number, since it uses as much as digits as its factorization.

121223513129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The spelling of 121223513129 in words is "one hundred twenty-one billion, two hundred twenty-three million, five hundred thirteen thousand, one hundred twenty-nine".