120020120021 has 2 divisors, whose sum is σ = 120020120022. Its totient is φ = 120020120020.

The previous prime is 120020119981. The next prime is 120020120027. The reversal of 120020120021 is 120021020021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64903167121 + 55116952900 = 254761^2 + 234770^2 .

It is a cyclic number.

It is not a de Polignac number, because 120020120021 - 2⁶ = 120020119957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120020119984 and 120020120011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120020120027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010060010 + 60010060011.

It is an arithmetic number, because the mean of its divisors is an integer number (60010060011).

Almost surely, 2^120020120021 is an apocalyptic number.

It is an amenable number.

120020120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

120020120021 is an equidigital number, since it uses as much as digits as its factorization.

120020120021 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 11.

Adding to 120020120021 its reverse (120021020021), we get a palindrome (240041140042).

The spelling of 120020120021 in words is "one hundred twenty billion, twenty million, one hundred twenty thousand, twenty-one".