2101200122221 has 2 divisors, whose sum is σ = 2101200122222. Its totient is φ = 2101200122220.

The previous prime is 2101200122137. The next prime is 2101200122237. The reversal of 2101200122221 is 1222210021012.

It is a happy number.

It is an a-pointer prime, because the next prime (2101200122237) can be obtained adding 2101200122221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1706798538025 + 394401584196 = 1306445^2 + 628014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101200122221 - 2¹⁵ = 2101200089453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101200122195 and 2101200122204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101200123221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050600061110 + 1050600061111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050600061111).

Almost surely, 2^{2101200122221} is an apocalyptic number.

It is an amenable number.

2101200122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101200122221 is an equidigital number, since it uses as much as digits as its factorization.

2101200122221 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 16.

Adding to 2101200122221 its reverse (1222210021012), we get a palindrome (3323410143233).

The spelling of 2101200122221 in words is "two trillion, one hundred one billion, two hundred million, one hundred twenty-two thousand, two hundred twenty-one".