21623445112 has 16 divisors (see below), whose sum is σ = 40567380840. Its totient is φ = 10805476896.

The previous prime is 21623445049. The next prime is 21623445113. The reversal of 21623445112 is 21154432612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623445113) 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, 765978 + ... + 793705.

Almost surely, 2^21623445112 is an apocalyptic number.

It is an amenable number.

21623445112 is a deficient number, since it is larger than the sum of its proper divisors (18943935728).

21623445112 is a wasteful number, since it uses less digits than its factorization.

21623445112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561422 (or 1561418 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

Adding to 21623445112 its reverse (21154432612), we get a palindrome (42777877724).

The spelling of 21623445112 in words is "twenty-one billion, six hundred twenty-three million, four hundred forty-five thousand, one hundred twelve".