210001000022221 has 2 divisors, whose sum is σ = 210001000022222. Its totient is φ = 210001000022220.

The previous prime is 210001000022207. The next prime is 210001000022293. The reversal of 210001000022221 is 122220000100012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123931109029225 + 86069890992996 = 11132435^2 + 9277386^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001000022221 - 2²⁹ = 210000463151309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210001000028221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000500011110 + 105000500011111.

It is an arithmetic number, because the mean of its divisors is an integer number (105000500011111).

Almost surely, 2^{210001000022221} is an apocalyptic number.

It is an amenable number.

210001000022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001000022221 is an equidigital number, since it uses as much as digits as its factorization.

210001000022221 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 210001000022221 its reverse (122220000100012), we get a palindrome (332221000122233).

The spelling of 210001000022221 in words is "two hundred ten trillion, one billion, twenty-two thousand, two hundred twenty-one".