210022020021221 has 2 divisors, whose sum is σ = 210022020021222. Its totient is φ = 210022020021220.

The previous prime is 210022020021199. The next prime is 210022020021259. The reversal of 210022020021221 is 122120020220012.

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., 181641361998721 + 28380658022500 = 13477439^2 + 5327350^2 .

It is a cyclic number.

It is not a de Polignac number, because 210022020021221 - 2¹⁸ = 210022019759077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210022020021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210022020071221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105011010010610 + 105011010010611.

It is an arithmetic number, because the mean of its divisors is an integer number (105011010010611).

Almost surely, 2^{210022020021221} is an apocalyptic number.

It is an amenable number.

210022020021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210022020021221 is an equidigital number, since it uses as much as digits as its factorization.

210022020021221 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 17.

Adding to 210022020021221 its reverse (122120020220012), we get a palindrome (332142040241233).

The spelling of 210022020021221 in words is "two hundred ten trillion, twenty-two billion, twenty million, twenty-one thousand, two hundred twenty-one".