120223721 has 2 divisors, whose sum is σ = 120223722. Its totient is φ = 120223720.

The previous prime is 120223687. The next prime is 120223723. The reversal of 120223721 is 127322021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118810000 + 1413721 = 10900^2 + 1189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120223721 is a prime.

Together with 120223723, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 120223693 and 120223702.

It is not a weakly prime, because it can be changed into another prime (120223723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60111860 + 60111861.

It is an arithmetic number, because the mean of its divisors is an integer number (60111861).

Almost surely, 2^120223721 is an apocalyptic number.

It is an amenable number.

120223721 is a deficient number, since it is larger than the sum of its proper divisors (1).

120223721 is an equidigital number, since it uses as much as digits as its factorization.

120223721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 120223721 is about 10964.6578149981. The cubic root of 120223721 is about 493.5487487032.

Adding to 120223721 its reverse (127322021), we get a palindrome (247545742).

The spelling of 120223721 in words is "one hundred twenty million, two hundred twenty-three thousand, seven hundred twenty-one".