121444775424 has 240 divisors, whose sum is σ = 409096816128. Its totient is φ = 33959817216.

The previous prime is 121444775401. The next prime is 121444775447. The reversal of 121444775424 is 424577444121.

121444775424 is a `hidden beast` number, since 1 + 21 + 44 + 47 + 7 + 542 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (121444775401) and next prime (121444775447).

It is a self number, because there is not a number n which added to its sum of digits gives 121444775424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1475979 + ... + 1556085.

Almost surely, 2^121444775424 is an apocalyptic number.

121444775424 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 121444775424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204548408064).

121444775424 is an abundant number, since it is smaller than the sum of its proper divisors (287652040704).

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

121444775424 is an equidigital number, since it uses as much as digits as its factorization.

121444775424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80185 (or 80166 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 45.

The spelling of 121444775424 in words is "one hundred twenty-one billion, four hundred forty-four million, seven hundred seventy-five thousand, four hundred twenty-four".