121128853240 has 64 divisors (see below), whose sum is σ = 284475110400. Its totient is φ = 46330998912.

The previous prime is 121128853213. The next prime is 121128853273. The reversal of 121128853240 is 42358821121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121128853240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3348289 + ... + 3384271.

It is an arithmetic number, because the mean of its divisors is an integer number (4444923600).

Almost surely, 2^121128853240 is an apocalyptic number.

121128853240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121128853240 is an abundant number, since it is smaller than the sum of its proper divisors (163346257160).

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

121128853240 is a wasteful number, since it uses less digits than its factorization.

121128853240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39676 (or 39672 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 121128853240 in words is "one hundred twenty-one billion, one hundred twenty-eight million, eight hundred fifty-three thousand, two hundred forty".