1020120120221 has 2 divisors, whose sum is σ = 1020120120222. Its totient is φ = 1020120120220.

The previous prime is 1020120120209. The next prime is 1020120120251. The reversal of 1020120120221 is 1220210210201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007634516100 + 12485604121 = 1003810^2 + 111739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020120120221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020120120196 and 1020120120205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020120120251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060060110 + 510060060111.

It is an arithmetic number, because the mean of its divisors is an integer number (510060060111).

Almost surely, 2^{1020120120221} is an apocalyptic number.

It is an amenable number.

1020120120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020120120221 is an equidigital number, since it uses as much as digits as its factorization.

1020120120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020120120221 its reverse (1220210210201), we get a palindrome (2240330330422).

The spelling of 1020120120221 in words is "one trillion, twenty billion, one hundred twenty million, one hundred twenty thousand, two hundred twenty-one".