122256478721 has 16 divisors (see below), whose sum is σ = 133648759104. Its totient is φ = 111148766784.

The previous prime is 122256478697. The next prime is 122256478759. The reversal of 122256478721 is 127874652221.

It is a cyclic number.

It is not a de Polignac number, because 122256478721 - 2⁶ = 122256478657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122256478781) 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 15 ways as a sum of consecutive naturals, for example, 8784050 + ... + 8797956.

It is an arithmetic number, because the mean of its divisors is an integer number (8353047444).

Almost surely, 2^122256478721 is an apocalyptic number.

It is an amenable number.

122256478721 is a deficient number, since it is larger than the sum of its proper divisors (11392280383).

122256478721 is a wasteful number, since it uses less digits than its factorization.

122256478721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24080.

The product of its digits is 752640, while the sum is 47.

It can be divided in two parts, 12225 and 6478721, that added together give a palindrome (6490946).

The spelling of 122256478721 in words is "one hundred twenty-two billion, two hundred fifty-six million, four hundred seventy-eight thousand, seven hundred twenty-one".