121042145225 has 6 divisors (see below), whose sum is σ = 150092260110. Its totient is φ = 96833716160.

The previous prime is 121042145209. The next prime is 121042145239. The reversal of 121042145225 is 522541240121.

It can be written as a sum of positive squares in 3 ways, for example, as 11377848889 + 109664296336 = 106667^2 + 331156^2 .

It is not a de Polignac number, because 121042145225 - 2⁴ = 121042145209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2420842880 + ... + 2420842929.

It is an arithmetic number, because the mean of its divisors is an integer number (25015376685).

Almost surely, 2^121042145225 is an apocalyptic number.

It is an amenable number.

121042145225 is a deficient number, since it is larger than the sum of its proper divisors (29050114885).

121042145225 is an equidigital number, since it uses as much as digits as its factorization.

121042145225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841685819 (or 4841685814 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 121042145225 its reverse (522541240121), we get a palindrome (643583385346).

The spelling of 121042145225 in words is "one hundred twenty-one billion, forty-two million, one hundred forty-five thousand, two hundred twenty-five".