21112112043 has 24 divisors (see below), whose sum is σ = 33451397616. Its totient is φ = 12724516800.

The previous prime is 21112112039. The next prime is 21112112053. The reversal of 21112112043 is 34021121112.

It is not a de Polignac number, because 21112112043 - 2² = 21112112039 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 571180 + ... + 607017.

It is an arithmetic number, because the mean of its divisors is an integer number (1393808234).

Almost surely, 2^21112112043 is an apocalyptic number.

21112112043 is a deficient number, since it is larger than the sum of its proper divisors (12339285573).

21112112043 is a wasteful number, since it uses less digits than its factorization.

21112112043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178395 (or 1178392 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21112112043 its reverse (34021121112), we get a palindrome (55133233155).

The spelling of 21112112043 in words is "twenty-one billion, one hundred twelve million, one hundred twelve thousand, forty-three".