121098655 has 4 divisors (see below), whose sum is σ = 145318392. Its totient is φ = 96878920.

The previous prime is 121098643. The next prime is 121098661. The reversal of 121098655 is 556890121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556890121 = 181 ⋅3076741.

It is not a de Polignac number, because 121098655 - 2¹⁹ = 120574367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12109861 + ... + 12109870.

It is an arithmetic number, because the mean of its divisors is an integer number (36329598).

Almost surely, 2^121098655 is an apocalyptic number.

121098655 is a deficient number, since it is larger than the sum of its proper divisors (24219737).

121098655 is an equidigital number, since it uses as much as digits as its factorization.

121098655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24219736.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 121098655 is about 11004.4834045038. The cubic root of 121098655 is about 494.7431310195.

The spelling of 121098655 in words is "one hundred twenty-one million, ninety-eight thousand, six hundred fifty-five".