121255550 has 48 divisors (see below), whose sum is σ = 245421792. Its totient is φ = 44304000.

The previous prime is 121255523. The next prime is 121255559. The reversal of 121255550 is 55552121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64727 + ... + 66573.

It is an arithmetic number, because the mean of its divisors is an integer number (5112954).

Almost surely, 2^121255550 is an apocalyptic number.

121255550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121255550 is an abundant number, since it is smaller than the sum of its proper divisors (124166242).

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

121255550 is a wasteful number, since it uses less digits than its factorization.

121255550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1968 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 121255550 is about 11011.6097824069. The cubic root of 121255550 is about 494.9567013108.

The spelling of 121255550 in words is "one hundred twenty-one million, two hundred fifty-five thousand, five hundred fifty".