120220021 has 2 divisors, whose sum is σ = 120220022. Its totient is φ = 120220020.

The previous prime is 120220007. The next prime is 120220033. The reversal of 120220021 is 120022021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 43744996 = 8745^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 120220021 - 2¹⁹ = 119695733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120220091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60110010 + 60110011.

It is an arithmetic number, because the mean of its divisors is an integer number (60110011).

Almost surely, 2^120220021 is an apocalyptic number.

It is an amenable number.

120220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

120220021 is an equidigital number, since it uses as much as digits as its factorization.

120220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 120220021 is about 10964.4890897843. The cubic root of 120220021 is about 493.5436855063.

Adding to 120220021 its reverse (120022021), we get a palindrome (240242042).

The spelling of 120220021 in words is "one hundred twenty million, two hundred twenty thousand, twenty-one".