121752421456 has 20 divisors (see below), whose sum is σ = 236240718912. Its totient is φ = 60787074656.

The previous prime is 121752421429. The next prime is 121752421457. The reversal of 121752421456 is 654124257121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121752421457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5559736 + ... + 5581591.

Almost surely, 2^121752421456 is an apocalyptic number.

121752421456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121752421456 is a deficient number, since it is larger than the sum of its proper divisors (114488297456).

121752421456 is a wasteful number, since it uses less digits than its factorization.

121752421456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11142018 (or 11142012 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

Adding to 121752421456 its reverse (654124257121), we get a palindrome (775876678577).

The spelling of 121752421456 in words is "one hundred twenty-one billion, seven hundred fifty-two million, four hundred twenty-one thousand, four hundred fifty-six".