21112112023 has 4 divisors (see below), whose sum is σ = 21253804200. Its totient is φ = 20970419848.

The previous prime is 21112111987. The next prime is 21112112039. The reversal of 21112112023 is 32021121112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21112112023 - 2¹⁷ = 21111980951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112111988 and 21112112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112112053) 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 3 ways as a sum of consecutive naturals, for example, 70845865 + ... + 70846162.

It is an arithmetic number, because the mean of its divisors is an integer number (5313451050).

Almost surely, 2^21112112023 is an apocalyptic number.

21112112023 is a deficient number, since it is larger than the sum of its proper divisors (141692177).

21112112023 is a wasteful number, since it uses less digits than its factorization.

21112112023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141692176.

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

Adding to 21112112023 its reverse (32021121112), we get a palindrome (53133233135).

The spelling of 21112112023 in words is "twenty-one billion, one hundred twelve million, one hundred twelve thousand, twenty-three".