121253562440 has 32 divisors (see below), whose sum is σ = 281621180160. Its totient is φ = 46936862400.

The previous prime is 121253562377. The next prime is 121253562467. The reversal of 121253562440 is 44265352121.

It is a self number, because there is not a number n which added to its sum of digits gives 121253562440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48891326 + ... + 48893805.

It is an arithmetic number, because the mean of its divisors is an integer number (8800661880).

Almost surely, 2^121253562440 is an apocalyptic number.

121253562440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121253562440 is an abundant number, since it is smaller than the sum of its proper divisors (160367617720).

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

121253562440 is a wasteful number, since it uses less digits than its factorization.

121253562440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97785173 (or 97785169 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 121253562440 in words is "one hundred twenty-one billion, two hundred fifty-three million, five hundred sixty-two thousand, four hundred forty".