21220002113 has 2 divisors, whose sum is σ = 21220002114. Its totient is φ = 21220002112.

The previous prime is 21220002073. The next prime is 21220002121. The reversal of 21220002113 is 31120002212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19075200769 + 2144801344 = 138113^2 + 46312^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220002113 - 2¹⁴ = 21219985729 is a prime.

It is not a weakly prime, because it can be changed into another prime (21226002113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610001056 + 10610001057.

It is an arithmetic number, because the mean of its divisors is an integer number (10610001057).

Almost surely, 2^21220002113 is an apocalyptic number.

It is an amenable number.

21220002113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220002113 is an equidigital number, since it uses as much as digits as its factorization.

21220002113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21220002113 its reverse (31120002212), we get a palindrome (52340004325).

Subtracting 21220002113 from its reverse (31120002212), we obtain a palindrome (9900000099).

The spelling of 21220002113 in words is "twenty-one billion, two hundred twenty million, two thousand, one hundred thirteen".