21110232231 has 80 divisors (see below), whose sum is σ = 35110521600. Its totient is φ = 12532734720.

The previous prime is 21110232217. The next prime is 21110232263. The reversal of 21110232231 is 13223201112.

21110232231 is a `hidden beast` number, since 211 + 102 + 322 + 31 = 666.

It is not a de Polignac number, because 21110232231 - 2¹⁹ = 21109707943 is a prime.

It is a super-2 number, since 2×21110232231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110232211) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11878815 + ... + 11880591.

It is an arithmetic number, because the mean of its divisors is an integer number (438881520).

Almost surely, 2^21110232231 is an apocalyptic number.

21110232231 is a deficient number, since it is larger than the sum of its proper divisors (14000289369).

21110232231 is a wasteful number, since it uses less digits than its factorization.

21110232231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066 (or 2057 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21110232231 its reverse (13223201112), we get a palindrome (34333433343).

The spelling of 21110232231 in words is "twenty-one billion, one hundred ten million, two hundred thirty-two thousand, two hundred thirty-one".