121351525123 has 2 divisors, whose sum is σ = 121351525124. Its totient is φ = 121351525122.

The previous prime is 121351525117. The next prime is 121351525151. The reversal of 121351525123 is 321525153121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (321525153121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121351525123 - 2²⁵ = 121317970691 is a prime.

It is not a weakly prime, because it can be changed into another prime (121351525103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60675762561 + 60675762562.

It is an arithmetic number, because the mean of its divisors is an integer number (60675762562).

Almost surely, 2^121351525123 is an apocalyptic number.

121351525123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121351525123 is an equidigital number, since it uses as much as digits as its factorization.

121351525123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

Adding to 121351525123 its reverse (321525153121), we get a palindrome (442876678244).

The spelling of 121351525123 in words is "one hundred twenty-one billion, three hundred fifty-one million, five hundred twenty-five thousand, one hundred twenty-three".