21120112231 has 8 divisors (see below), whose sum is σ = 22382951184. Its totient is φ = 19859548800.

The previous prime is 21120112219. The next prime is 21120112241. The reversal of 21120112231 is 13221102112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120112231 - 2¹¹ = 21120110183 is a prime.

It is a super-2 number, since 2×21120112231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120112201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549745 + ... + 586906.

It is an arithmetic number, because the mean of its divisors is an integer number (2797868898).

Almost surely, 2^21120112231 is an apocalyptic number.

21120112231 is a deficient number, since it is larger than the sum of its proper divisors (1262838953).

21120112231 is a wasteful number, since it uses less digits than its factorization.

21120112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137761.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120112231 its reverse (13221102112), we get a palindrome (34341214343).

The spelling of 21120112231 in words is "twenty-one billion, one hundred twenty million, one hundred twelve thousand, two hundred thirty-one".