21112104431 has 16 divisors (see below), whose sum is σ = 23109152256. Its totient is φ = 19128120000.

The previous prime is 21112104427. The next prime is 21112104523. The reversal of 21112104431 is 13440121112.

It is not a de Polignac number, because 21112104431 - 2² = 21112104427 is a prime.

It is a super-2 number, since 2×21112104431² (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 (21112104401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6261176 + ... + 6264546.

It is an arithmetic number, because the mean of its divisors is an integer number (1444322016).

Almost surely, 2^21112104431 is an apocalyptic number.

21112104431 is a deficient number, since it is larger than the sum of its proper divisors (1997047825).

21112104431 is a wasteful number, since it uses less digits than its factorization.

21112104431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21112104431 its reverse (13440121112), we get a palindrome (34552225543).

The spelling of 21112104431 in words is "twenty-one billion, one hundred twelve million, one hundred four thousand, four hundred thirty-one".