122755721 has 4 divisors (see below), whose sum is σ = 133915344. Its totient is φ = 111596100.

The previous prime is 122755697. The next prime is 122755723. The reversal of 122755721 is 127557221.

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 not a de Polignac number, because 122755721 - 2¹⁸ = 122493577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122755723) 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, 5579795 + ... + 5579816.

It is an arithmetic number, because the mean of its divisors is an integer number (33478836).

Almost surely, 2^122755721 is an apocalyptic number.

122755721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122755721 is a deficient number, since it is larger than the sum of its proper divisors (11159623).

122755721 is a wasteful number, since it uses less digits than its factorization.

122755721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159622.

The product of its digits is 9800, while the sum is 32.

The square root of 122755721 is about 11079.5180851876. The cubic root of 122755721 is about 496.9895386225.

It can be divided in two parts, 1 and 22755721, that added together give a palindrome (22755722).

The spelling of 122755721 in words is "one hundred twenty-two million, seven hundred fifty-five thousand, seven hundred twenty-one".