1021020020221 has 2 divisors, whose sum is σ = 1021020020222. Its totient is φ = 1021020020220.

The previous prime is 1021020020171. The next prime is 1021020020249. The reversal of 1021020020221 is 1220200201201.

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., 1019837416900 + 1182603321 = 1009870^2 + 34389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020020221 - 2¹³ = 1021020012029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021020020021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510010110 + 510510010111.

It is an arithmetic number, because the mean of its divisors is an integer number (510510010111).

Almost surely, 2^{1021020020221} is an apocalyptic number.

It is an amenable number.

1021020020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020020221 is an equidigital number, since it uses as much as digits as its factorization.

1021020020221 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 13.

Adding to 1021020020221 its reverse (1220200201201), we get a palindrome (2241220221422).

The spelling of 1021020020221 in words is "one trillion, twenty-one billion, twenty million, twenty thousand, two hundred twenty-one".