121555225 has 12 divisors (see below), whose sum is σ = 164431440. Its totient is φ = 88403600.

The previous prime is 121555183. The next prime is 121555229. The reversal of 121555225 is 522555121.

It is not a de Polignac number, because 121555225 - 2²³ = 113166617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121555193 and 121555202.

It is not an unprimeable number, because it can be changed into a prime (121555229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220735 + ... + 221284.

It is an arithmetic number, because the mean of its divisors is an integer number (13702620).

Almost surely, 2^121555225 is an apocalyptic number.

It is an amenable number.

121555225 is a deficient number, since it is larger than the sum of its proper divisors (42876215).

121555225 is a wasteful number, since it uses less digits than its factorization.

121555225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442040 (or 442035 counting only the distinct ones).

The product of its digits is 5000, while the sum is 28.

The square root of 121555225 is about 11025.2086148063. The cubic root of 121555225 is about 495.3641166806.

The spelling of 121555225 in words is "one hundred twenty-one million, five hundred fifty-five thousand, two hundred twenty-five".