21234421113 has 16 divisors (see below), whose sum is σ = 28792192320. Its totient is φ = 13917705984.

The previous prime is 21234421099. The next prime is 21234421133. The reversal of 21234421113 is 31112443212.

It is not a de Polignac number, because 21234421113 - 2⁶ = 21234421049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21234421133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86343 + ... + 223436.

It is an arithmetic number, because the mean of its divisors is an integer number (1799512020).

Almost surely, 2^21234421113 is an apocalyptic number.

It is an amenable number.

21234421113 is a deficient number, since it is larger than the sum of its proper divisors (7557771207).

21234421113 is a wasteful number, since it uses less digits than its factorization.

21234421113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310168.

The product of its digits is 1152, while the sum is 24.

Adding to 21234421113 its reverse (31112443212), we get a palindrome (52346864325).

The spelling of 21234421113 in words is "twenty-one billion, two hundred thirty-four million, four hundred twenty-one thousand, one hundred thirteen".