121550550 has 144 divisors (see below), whose sum is σ = 342176016. Its totient is φ = 28512000.

The previous prime is 121550537. The next prime is 121550599. The reversal of 121550550 is 55055121.

It is a self number, because there is not a number n which added to its sum of digits gives 121550550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 671460 + ... + 671640.

Almost surely, 2^121550550 is an apocalyptic number.

121550550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121550550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171088008).

121550550 is an abundant number, since it is smaller than the sum of its proper divisors (220625466).

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

121550550 is a wasteful number, since it uses less digits than its factorization.

121550550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 121550550 is about 11024.9965986389. The cubic root of 121550550 is about 495.3577660502.

The spelling of 121550550 in words is "one hundred twenty-one million, five hundred fifty thousand, five hundred fifty".