121098555 has 48 divisors (see below), whose sum is σ = 221405184. Its totient is φ = 61139520.

The previous prime is 121098541. The next prime is 121098569. The reversal of 121098555 is 555890121.

It is a happy number.

121098555 is a `hidden beast` number, since 1 + 2 + 10 + 98 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (121098541) and next prime (121098569).

It is not a de Polignac number, because 121098555 - 2⁴ = 121098539 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64642 + ... + 66488.

It is an arithmetic number, because the mean of its divisors is an integer number (4612608).

Almost surely, 2^121098555 is an apocalyptic number.

121098555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121098555 is a deficient number, since it is larger than the sum of its proper divisors (100306629).

121098555 is a wasteful number, since it uses less digits than its factorization.

121098555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936 (or 1933 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 121098555 is about 11004.4788609002. The cubic root of 121098555 is about 494.7429948376.

The spelling of 121098555 in words is "one hundred twenty-one million, ninety-eight thousand, five hundred fifty-five".