121255554 has 64 divisors (see below), whose sum is σ = 289578240. Its totient is φ = 33116160.

The previous prime is 121255523. The next prime is 121255559. The reversal of 121255554 is 455552121.

It is not an unprimeable number, because it can be changed into a prime (121255559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137194 + ... + 138074.

It is an arithmetic number, because the mean of its divisors is an integer number (4524660).

Almost surely, 2^121255554 is an apocalyptic number.

121255554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121255554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144789120).

121255554 is an abundant number, since it is smaller than the sum of its proper divisors (168322686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121255554 is a wasteful number, since it uses less digits than its factorization.

121255554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its digits is 10000, while the sum is 30.

The square root of 121255554 is about 11011.6099640334. The cubic root of 121255554 is about 494.9567067534.

The spelling of 121255554 in words is "one hundred twenty-one million, two hundred fifty-five thousand, five hundred fifty-four".