21221211113 has 2 divisors, whose sum is σ = 21221211114. Its totient is φ = 21221211112.

The previous prime is 21221211097. The next prime is 21221211149. The reversal of 21221211113 is 31111212212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14178141184 + 7043069929 = 119072^2 + 83923^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221211113 - 2⁴ = 21221211097 is a prime.

It is a super-2 number, since 2×21221211113² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221211091 and 21221211100.

It is not a weakly prime, because it can be changed into another prime (21221211173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610605556 + 10610605557.

It is an arithmetic number, because the mean of its divisors is an integer number (10610605557).

Almost surely, 2^21221211113 is an apocalyptic number.

It is an amenable number.

21221211113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221211113 is an equidigital number, since it uses as much as digits as its factorization.

21221211113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

Adding to 21221211113 its reverse (31111212212), we get a palindrome (52332423325).

The spelling of 21221211113 in words is "twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, one hundred thirteen".