210221110022221 has 2 divisors, whose sum is σ = 210221110022222. Its totient is φ = 210221110022220.

The previous prime is 210221110022179. The next prime is 210221110022243. The reversal of 210221110022221 is 122220011122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209143977399721 + 1077132622500 = 14461811^2 + 1037850^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221110022221 - 2¹³ = 210221110014029 is a prime.

It is a super-2 number, since 2×210221110022221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221210022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110555011110 + 105110555011111.

It is an arithmetic number, because the mean of its divisors is an integer number (105110555011111).

Almost surely, 2^{210221110022221} is an apocalyptic number.

It is an amenable number.

210221110022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221110022221 is an equidigital number, since it uses as much as digits as its factorization.

210221110022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210221110022221 its reverse (122220011122012), we get a palindrome (332441121144233).

The spelling of 210221110022221 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred ten million, twenty-two thousand, two hundred twenty-one".