122255557721 has 4 divisors (see below), whose sum is σ = 133369699344. Its totient is φ = 111141416100.

The previous prime is 122255557709. The next prime is 122255557733. The reversal of 122255557721 is 127755552221.

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 an interprime number because it is at equal distance from previous prime (122255557709) and next prime (122255557733).

It is not a de Polignac number, because 122255557721 - 2¹⁰ = 122255556697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122255557321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5557070795 + ... + 5557070816.

It is an arithmetic number, because the mean of its divisors is an integer number (33342424836).

Almost surely, 2^122255557721 is an apocalyptic number.

122255557721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122255557721 is a deficient number, since it is larger than the sum of its proper divisors (11114141623).

122255557721 is a wasteful number, since it uses less digits than its factorization.

122255557721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11114141622.

The product of its digits is 490000, while the sum is 44.

It can be divided in two parts, 122255 and 557721, that added together give a palindrome (679976).

The spelling of 122255557721 in words is "one hundred twenty-two billion, two hundred fifty-five million, five hundred fifty-seven thousand, seven hundred twenty-one".