2113204430221 has 2 divisors, whose sum is σ = 2113204430222. Its totient is φ = 2113204430220.

The previous prime is 2113204430171. The next prime is 2113204430243. The reversal of 2113204430221 is 1220344023112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178985527721 + 934218902500 = 1085811^2 + 966550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113204430221 - 2⁷ = 2113204430093 is a prime.

It is a super-2 number, since 2×2113204430221² (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 (2113204430021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056602215110 + 1056602215111.

It is an arithmetic number, because the mean of its divisors is an integer number (1056602215111).

Almost surely, 2^{2113204430221} is an apocalyptic number.

It is an amenable number.

2113204430221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113204430221 is an equidigital number, since it uses as much as digits as its factorization.

2113204430221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 2113204430221 its reverse (1220344023112), we get a palindrome (3333548453333).

The spelling of 2113204430221 in words is "two trillion, one hundred thirteen billion, two hundred four million, four hundred thirty thousand, two hundred twenty-one".