121210055 has 16 divisors (see below), whose sum is σ = 147005280. Its totient is φ = 95939712.

The previous prime is 121210049. The next prime is 121210081. The reversal of 121210055 is 550012121.

It is a cyclic number.

It is not a de Polignac number, because 121210055 - 2⁸ = 121209799 is a prime.

It is a congruent number.

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, 305117 + ... + 305513.

It is an arithmetic number, because the mean of its divisors is an integer number (9187830).

Almost surely, 2^121210055 is an apocalyptic number.

121210055 is a deficient number, since it is larger than the sum of its proper divisors (25795225).

121210055 is a wasteful number, since it uses less digits than its factorization.

121210055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 121210055 is about 11009.5438143458. The cubic root of 121210055 is about 494.8947910946.

Adding to 121210055 its reverse (550012121), we get a palindrome (671222176).

The spelling of 121210055 in words is "one hundred twenty-one million, two hundred ten thousand, fifty-five".