122730721 has 4 divisors (see below), whose sum is σ = 122781744. Its totient is φ = 122679700.

The previous prime is 122730703. The next prime is 122730731. The reversal of 122730721 is 127037221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127037221 = 397 ⋅319993.

It is a cyclic number.

It is not a de Polignac number, because 122730721 - 2²³ = 114342113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122730731) 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, 21715 + ... + 26776.

It is an arithmetic number, because the mean of its divisors is an integer number (30695436).

Almost surely, 2^122730721 is an apocalyptic number.

It is an amenable number.

122730721 is a deficient number, since it is larger than the sum of its proper divisors (51023).

122730721 is an equidigital number, since it uses as much as digits as its factorization.

122730721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51022.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 122730721 is about 11078.3898198249. The cubic root of 122730721 is about 496.9557979492.

Adding to 122730721 its reverse (127037221), we get a palindrome (249767942).

The spelling of 122730721 in words is "one hundred twenty-two million, seven hundred thirty thousand, seven hundred twenty-one".