21110112231 has 16 divisors (see below), whose sum is σ = 30624455904. Its totient is φ = 12856909824.

The previous prime is 21110112227. The next prime is 21110112251. The reversal of 21110112231 is 13221101112.

It is not a de Polignac number, because 21110112231 - 2² = 21110112227 is a prime.

It is a super-2 number, since 2×21110112231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21110112231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110112251) 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, 2786346 + ... + 2793911.

It is an arithmetic number, because the mean of its divisors is an integer number (1914028494).

Almost surely, 2^21110112231 is an apocalyptic number.

21110112231 is a deficient number, since it is larger than the sum of its proper divisors (9514343673).

21110112231 is a wasteful number, since it uses less digits than its factorization.

21110112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580370.

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

Adding to 21110112231 its reverse (13221101112), we get a palindrome (34331213343).

The spelling of 21110112231 in words is "twenty-one billion, one hundred ten million, one hundred twelve thousand, two hundred thirty-one".