121730550 has 48 divisors (see below), whose sum is σ = 304861440. Its totient is φ = 32142240.

The previous prime is 121730537. The next prime is 121730569. The reversal of 121730550 is 55037121.

It is a self number, because there is not a number n which added to its sum of digits gives 121730550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11511 + ... + 19389.

It is an arithmetic number, because the mean of its divisors is an integer number (6351280).

Almost surely, 2^121730550 is an apocalyptic number.

121730550 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 121730550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152430720).

121730550 is an abundant number, since it is smaller than the sum of its proper divisors (183130890).

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

121730550 is a wasteful number, since it uses less digits than its factorization.

121730550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7997 (or 7992 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 121730550 is about 11033.1568465240. The cubic root of 121730550 is about 495.6021648362.

Adding to 121730550 its reverse (55037121), we get a palindrome (176767671).

The spelling of 121730550 in words is "one hundred twenty-one million, seven hundred thirty thousand, five hundred fifty".