121125510 has 128 divisors (see below), whose sum is σ = 373248000. Its totient is φ = 27624960.

The previous prime is 121125479. The next prime is 121125553. The reversal of 121125510 is 15521121.

121125510 is a `hidden beast` number, since 1 + 2 + 112 + 551 + 0 = 666.

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

It is a congruent 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 63 ways as a sum of consecutive naturals, for example, 49291 + ... + 51689.

It is an arithmetic number, because the mean of its divisors is an integer number (2916000).

Almost surely, 2^121125510 is an apocalyptic number.

121125510 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 121125510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186624000).

121125510 is an abundant number, since it is smaller than the sum of its proper divisors (252122490).

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

121125510 is a wasteful number, since it uses less digits than its factorization.

121125510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121125510 is about 11005.7035213566. The cubic root of 121125510 is about 494.7796999497.

Adding to 121125510 its reverse (15521121), we get a palindrome (136646631).

The spelling of 121125510 in words is "one hundred twenty-one million, one hundred twenty-five thousand, five hundred ten".