121125858 has 64 divisors (see below), whose sum is σ = 283668480. Its totient is φ = 33768000.

The previous prime is 121125857. The next prime is 121125859. The reversal of 121125858 is 858521121.

It is an interprime number because it is at equal distance from previous prime (121125857) and next prime (121125859).

It is not an unprimeable number, because it can be changed into a prime (121125853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450148 + ... + 450416.

It is an arithmetic number, because the mean of its divisors is an integer number (4432320).

Almost surely, 2^121125858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121125858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141834240).

121125858 is an abundant number, since it is smaller than the sum of its proper divisors (162542622).

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

121125858 is a wasteful number, since it uses less digits than its factorization.

121125858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 6400, while the sum is 33.

The square root of 121125858 is about 11005.7193313295. The cubic root of 121125858 is about 494.7801737920.

Adding to 121125858 its reverse (858521121), we get a palindrome (979646979).

The spelling of 121125858 in words is "one hundred twenty-one million, one hundred twenty-five thousand, eight hundred fifty-eight".