121253555 has 16 divisors (see below), whose sum is σ = 152755200. Its totient is φ = 92275680.

The previous prime is 121253533. The next prime is 121253567. The reversal of 121253555 is 555352121.

It is not a de Polignac number, because 121253555 - 2⁶ = 121253491 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2516 + ... + 15774.

It is an arithmetic number, because the mean of its divisors is an integer number (9547200).

Almost surely, 2^121253555 is an apocalyptic number.

121253555 is a deficient number, since it is larger than the sum of its proper divisors (31501645).

121253555 is a wasteful number, since it uses less digits than its factorization.

121253555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13354.

The product of its digits is 7500, while the sum is 29.

The square root of 121253555 is about 11011.5191958240. The cubic root of 121253555 is about 494.9539868123.

The spelling of 121253555 in words is "one hundred twenty-one million, two hundred fifty-three thousand, five hundred fifty-five".