121457909424 has 20 divisors (see below), whose sum is σ = 313766266136. Its totient is φ = 40485969792.

The previous prime is 121457909401. The next prime is 121457909471. The reversal of 121457909424 is 424909754121.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 2530373113 = 121457909424 / (1 + 2 + 1 + 4 + 5 + 7 + 9 + 0 + 9 + 4 + 2 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1265186509 + ... + 1265186604.

Almost surely, 2^121457909424 is an apocalyptic number.

It is an amenable number.

121457909424 is an abundant number, since it is smaller than the sum of its proper divisors (192308356712).

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

121457909424 is a wasteful number, since it uses less digits than its factorization.

121457909424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530373124 (or 2530373118 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 121457909424 in words is "one hundred twenty-one billion, four hundred fifty-seven million, nine hundred nine thousand, four hundred twenty-four".