2101200012221 has 2 divisors, whose sum is σ = 2101200012222. Its totient is φ = 2101200012220.

The previous prime is 2101200012133. The next prime is 2101200012227. The reversal of 2101200012221 is 1222100021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1882353816121 + 218846196100 = 1371989^2 + 467810^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101200012221 - 2¹⁸ = 2101199750077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101200012196 and 2101200012205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101200012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050600006110 + 1050600006111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050600006111).

Almost surely, 2^{2101200012221} is an apocalyptic number.

It is an amenable number.

2101200012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101200012221 is an equidigital number, since it uses as much as digits as its factorization.

2101200012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2101200012221 its reverse (1222100021012), we get a palindrome (3323300033233).

The spelling of 2101200012221 in words is "two trillion, one hundred one billion, two hundred million, twelve thousand, two hundred twenty-one".