1021021010221 has 2 divisors, whose sum is σ = 1021021010222. Its totient is φ = 1021021010220.

The previous prime is 1021021010173. The next prime is 1021021010227. The reversal of 1021021010221 is 1220101201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 871552944900 + 149468065321 = 933570^2 + 386611^2 .

It is an emirp because it is prime and its reverse (1220101201201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021021010221 - 2¹¹ = 1021021008173 is a prime.

It is a super-2 number, since 2×1021021010221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021021010227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510505110 + 510510505111.

It is an arithmetic number, because the mean of its divisors is an integer number (510510505111).

Almost surely, 2^{1021021010221} is an apocalyptic number.

It is an amenable number.

1021021010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021021010221 is an equidigital number, since it uses as much as digits as its factorization.

1021021010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021021010221 its reverse (1220101201201), we get a palindrome (2241122211422).

The spelling of 1021021010221 in words is "one trillion, twenty-one billion, twenty-one million, ten thousand, two hundred twenty-one".