210112212221 has 2 divisors, whose sum is σ = 210112212222. Its totient is φ = 210112212220.

The previous prime is 210112212209. The next prime is 210112212263. The reversal of 210112212221 is 122212211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182286302500 + 27825909721 = 426950^2 + 166811^2 .

It is a cyclic number.

It is not a de Polignac number, because 210112212221 - 2¹⁸ = 210111950077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210112212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210112212721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105056106110 + 105056106111.

It is an arithmetic number, because the mean of its divisors is an integer number (105056106111).

Almost surely, 2^210112212221 is an apocalyptic number.

It is an amenable number.

210112212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210112212221 is an equidigital number, since it uses as much as digits as its factorization.

210112212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210112212221 its reverse (122212211012), we get a palindrome (332324423233).

The spelling of 210112212221 in words is "two hundred ten billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".