121265550 has 144 divisors (see below), whose sum is σ = 376395552. Its totient is φ = 27417600.

The previous prime is 121265509. The next prime is 121265563. The reversal of 121265550 is 55562121.

121265550 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 655 + 5 + 0 = 666.

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, 431410 + ... + 431690.

It is an arithmetic number, because the mean of its divisors is an integer number (2613858).

Almost surely, 2^121265550 is an apocalyptic number.

121265550 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 121265550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188197776).

121265550 is an abundant number, since it is smaller than the sum of its proper divisors (255130002).

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

121265550 is a wasteful number, since it uses less digits than its factorization.

121265550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 121265550 is about 11012.0638392628. The cubic root of 121265550 is about 494.9703073710.

The spelling of 121265550 in words is "one hundred twenty-one million, two hundred sixty-five thousand, five hundred fifty".