21211110113 has 2 divisors, whose sum is σ = 21211110114. Its totient is φ = 21211110112.

The previous prime is 21211110097. The next prime is 21211110127. The reversal of 21211110113 is 31101111212.

It is an a-pointer prime, because the next prime (21211110127) can be obtained adding 21211110113 to its sum of digits (14).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16427036224 + 4784073889 = 128168^2 + 69167^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211110113 - 2⁴ = 21211110097 is a prime.

It is a super-2 number, since 2×21211110113² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21211110143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605555056 + 10605555057.

It is an arithmetic number, because the mean of its divisors is an integer number (10605555057).

Almost surely, 2^21211110113 is an apocalyptic number.

It is an amenable number.

21211110113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211110113 is an equidigital number, since it uses as much as digits as its factorization.

21211110113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21211110113 its reverse (31101111212), we get a palindrome (52312221325).

The spelling of 21211110113 in words is "twenty-one billion, two hundred eleven million, one hundred ten thousand, one hundred thirteen".