21211210113 has 16 divisors (see below), whose sum is σ = 29066468736. Its totient is φ = 13748918400.

The previous prime is 21211210109. The next prime is 21211210133. The reversal of 21211210113 is 31101211212.

It is not a de Polignac number, because 21211210113 - 2² = 21211210109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211210092 and 21211210101.

It is not an unprimeable number, because it can be changed into a prime (21211210103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92388 + ... + 225738.

It is an arithmetic number, because the mean of its divisors is an integer number (1816654296).

Almost surely, 2^21211210113 is an apocalyptic number.

It is an amenable number.

21211210113 is a deficient number, since it is larger than the sum of its proper divisors (7855258623).

21211210113 is a wasteful number, since it uses less digits than its factorization.

21211210113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134824.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21211210113 its reverse (31101211212), we get a palindrome (52312421325).

The spelling of 21211210113 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred thirteen".