121224454877 has 4 divisors (see below), whose sum is σ = 121226781600. Its totient is φ = 121222128156.

The previous prime is 121224454853. The next prime is 121224454907. The reversal of 121224454877 is 778454422121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121224454877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121224454837) by changing a digit.

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, 1083377 + ... + 1190022.

It is an arithmetic number, because the mean of its divisors is an integer number (30306695400).

Almost surely, 2^121224454877 is an apocalyptic number.

It is an amenable number.

121224454877 is a deficient number, since it is larger than the sum of its proper divisors (2326723).

121224454877 is an equidigital number, since it uses as much as digits as its factorization.

121224454877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326722.

The product of its digits is 1003520, while the sum is 47.

Adding to 121224454877 its reverse (778454422121), we get a palindrome (899678876998).

The spelling of 121224454877 in words is "one hundred twenty-one billion, two hundred twenty-four million, four hundred fifty-four thousand, eight hundred seventy-seven".