2112100223221 has 2 divisors, whose sum is σ = 2112100223222. Its totient is φ = 2112100223220.

The previous prime is 2112100223209. The next prime is 2112100223257. The reversal of 2112100223221 is 1223220012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1381906047025 + 730194176196 = 1175545^2 + 854514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112100223221 - 2¹¹ = 2112100221173 is a prime.

It is a super-2 number, since 2×2112100223221² (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 (2112100223921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056050111610 + 1056050111611.

It is an arithmetic number, because the mean of its divisors is an integer number (1056050111611).

Almost surely, 2^{2112100223221} is an apocalyptic number.

It is an amenable number.

2112100223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112100223221 is an equidigital number, since it uses as much as digits as its factorization.

2112100223221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2112100223221 its reverse (1223220012112), we get a palindrome (3335320235333).

The spelling of 2112100223221 in words is "two trillion, one hundred twelve billion, one hundred million, two hundred twenty-three thousand, two hundred twenty-one".