1021110120221 has 2 divisors, whose sum is σ = 1021110120222. Its totient is φ = 1021110120220.

The previous prime is 1021110120181. The next prime is 1021110120241. The reversal of 1021110120221 is 1220210111201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 918703080100 + 102407040121 = 958490^2 + 320011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021110120221 - 2³⁸ = 746232213277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021110120196 and 1021110120205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021110120241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510555060110 + 510555060111.

It is an arithmetic number, because the mean of its divisors is an integer number (510555060111).

Almost surely, 2^{1021110120221} is an apocalyptic number.

It is an amenable number.

1021110120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021110120221 is an equidigital number, since it uses as much as digits as its factorization.

1021110120221 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 14.

Adding to 1021110120221 its reverse (1220210111201), we get a palindrome (2241320231422).

The spelling of 1021110120221 in words is "one trillion, twenty-one billion, one hundred ten million, one hundred twenty thousand, two hundred twenty-one".