121555405225 has 12 divisors (see below), whose sum is σ = 151915546624. Its totient is φ = 96478618320.

The previous prime is 121555405217. The next prime is 121555405243. The reversal of 121555405225 is 522504555121.

It is not a de Polignac number, because 121555405225 - 2³ = 121555405217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19139409 + ... + 19145758.

Almost surely, 2^121555405225 is an apocalyptic number.

It is an amenable number.

121555405225 is a deficient number, since it is larger than the sum of its proper divisors (30360141399).

121555405225 is a wasteful number, since it uses less digits than its factorization.

121555405225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38285304 (or 38285299 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 121555405225 in words is "one hundred twenty-one billion, five hundred fifty-five million, four hundred five thousand, two hundred twenty-five".