122707721 has 4 divisors (see below), whose sum is σ = 122739012. Its totient is φ = 122676432.

The previous prime is 122707709. The next prime is 122707723. The reversal of 122707721 is 127707221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 119683600 = 1739^2 + 10940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122707721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122707723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8750 + ... + 17943.

It is an arithmetic number, because the mean of its divisors is an integer number (30684753).

Almost surely, 2^122707721 is an apocalyptic number.

It is an amenable number.

122707721 is a deficient number, since it is larger than the sum of its proper divisors (31291).

122707721 is an equidigital number, since it uses as much as digits as its factorization.

122707721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31290.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 122707721 is about 11077.3517141960. The cubic root of 122707721 is about 496.9247524828.

It can be divided in two parts, 12270 and 7721, that added together give a palindrome (19991).

The spelling of 122707721 in words is "one hundred twenty-two million, seven hundred seven thousand, seven hundred twenty-one".