121491752424 has 128 divisors (see below), whose sum is σ = 368248032000. Its totient is φ = 32606945280.

The previous prime is 121491752423. The next prime is 121491752429. The reversal of 121491752424 is 424257194121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (121491752423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1447152 + ... + 1528800.

It is an arithmetic number, because the mean of its divisors is an integer number (2876937750).

Almost surely, 2^121491752424 is an apocalyptic number.

121491752424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121491752424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184124016000).

121491752424 is an abundant number, since it is smaller than the sum of its proper divisors (246756279576).

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

121491752424 is a wasteful number, since it uses less digits than its factorization.

121491752424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82203 (or 82199 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The spelling of 121491752424 in words is "one hundred twenty-one billion, four hundred ninety-one million, seven hundred fifty-two thousand, four hundred twenty-four".