121551251250 has 160 divisors (see below), whose sum is σ = 356891008320. Its totient is φ = 27200160000.

The previous prime is 121551251249. The next prime is 121551251267. The reversal of 121551251250 is 52152155121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 422916 + ... + 649584.

It is an arithmetic number, because the mean of its divisors is an integer number (2230568802).

Almost surely, 2^121551251250 is an apocalyptic number.

121551251250 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 121551251250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178445504160).

121551251250 is an abundant number, since it is smaller than the sum of its proper divisors (235339757070).

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

121551251250 is a wasteful number, since it uses less digits than its factorization.

121551251250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226718 (or 226703 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 30.

The spelling of 121551251250 in words is "one hundred twenty-one billion, five hundred fifty-one million, two hundred fifty-one thousand, two hundred fifty".