120721 has 2 divisors, whose sum is σ = 120722. Its totient is φ = 120720.

The previous prime is 120713. The next prime is 120737. The reversal of 120721 is 127021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65025 + 55696 = 255^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 120721 - 2³ = 120713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60360 + 60361.

It is an arithmetic number, because the mean of its divisors is an integer number (60361).

2¹²⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

120721 is a deficient number, since it is larger than the sum of its proper divisors (1).

120721 is an equidigital number, since it uses as much as digits as its factorization.

120721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 120721 is about 347.4492768736. The cubic root of 120721 is about 49.4228297937.

Adding to 120721 its reverse (127021), we get a palindrome (247742).

It can be divided in two parts, 120 and 721, that added together give a square (841 = 29²).

The spelling of 120721 in words is "one hundred twenty thousand, seven hundred twenty-one", and thus it is an iban number.