121720050 has 48 divisors (see below), whose sum is σ = 335410080. Its totient is φ = 32458320.

The previous prime is 121720031. The next prime is 121720069. The reversal of 121720050 is 50027121.

It is an interprime number because it is at equal distance from previous prime (121720031) and next prime (121720069).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 43732 + ... + 46431.

It is an arithmetic number, because the mean of its divisors is an integer number (6987710).

Almost surely, 2^121720050 is an apocalyptic number.

121720050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121720050 is an abundant number, since it is smaller than the sum of its proper divisors (213690030).

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

121720050 is a wasteful number, since it uses less digits than its factorization.

121720050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90184 (or 90173 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 121720050 is about 11032.6809978355. The cubic root of 121720050 is about 495.5879148599.

Adding to 121720050 its reverse (50027121), we get a palindrome (171747171).

The spelling of 121720050 in words is "one hundred twenty-one million, seven hundred twenty thousand, fifty".