21113430211 has 16 divisors (see below), whose sum is σ = 23539692960. Its totient is φ = 18819440640.

The previous prime is 21113430199. The next prime is 21113430223. The reversal of 21113430211 is 11203431112.

It is an interprime number because it is at equal distance from previous prime (21113430199) and next prime (21113430223).

It is not a de Polignac number, because 21113430211 - 2¹³ = 21113422019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113430271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1185291 + ... + 1202971.

It is an arithmetic number, because the mean of its divisors is an integer number (1471230810).

Almost surely, 2^21113430211 is an apocalyptic number.

21113430211 is a deficient number, since it is larger than the sum of its proper divisors (2426262749).

21113430211 is a wasteful number, since it uses less digits than its factorization.

21113430211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21414.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113430211 its reverse (11203431112), we get a palindrome (32316861323).

Subtracting from 21113430211 its reverse (11203431112), we obtain a palindrome (9909999099).

The spelling of 21113430211 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, two hundred eleven".