21210222113 has 2 divisors, whose sum is σ = 21210222114. Its totient is φ = 21210222112.

The previous prime is 21210222073. The next prime is 21210222157. The reversal of 21210222113 is 31122201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20537182864 + 673039249 = 143308^2 + 25943^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210222113 - 2¹⁶ = 21210156577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210222091 and 21210222100.

It is not a weakly prime, because it can be changed into another prime (21210222013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605111056 + 10605111057.

It is an arithmetic number, because the mean of its divisors is an integer number (10605111057).

Almost surely, 2^21210222113 is an apocalyptic number.

It is an amenable number.

21210222113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210222113 is an equidigital number, since it uses as much as digits as its factorization.

21210222113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21210222113 its reverse (31122201212), we get a palindrome (52332423325).

The spelling of 21210222113 in words is "twenty-one billion, two hundred ten million, two hundred twenty-two thousand, one hundred thirteen".