122721442 has 4 divisors (see below), whose sum is σ = 184082166. Its totient is φ = 61360720.

The previous prime is 122721413. The next prime is 122721457. The reversal of 122721442 is 244127221.

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

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 39200121 = 9139^2 + 6261^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30680359 + ... + 30680362.

Almost surely, 2^122721442 is an apocalyptic number.

122721442 is a deficient number, since it is larger than the sum of its proper divisors (61360724).

122721442 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 8 representation: 122721442 = (724112242)₈.

122721442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61360723.

The product of its digits is 1792, while the sum is 25.

The square root of 122721442 is about 11077.9710236126. The cubic root of 122721442 is about 496.9432735950.

Adding to 122721442 its reverse (244127221), we get a palindrome (366848663).

The spelling of 122721442 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, four hundred forty-two".