21423412112 has 20 divisors (see below), whose sum is σ = 41521489776. Its totient is φ = 10708188960.

The previous prime is 21423412111. The next prime is 21423412139. The reversal of 21423412112 is 21121432412.

It is not an unprimeable number, because it can be changed into a prime (21423412111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169214 + ... + 267357.

Almost surely, 2^21423412112 is an apocalyptic number.

It is an amenable number.

21423412112 is a deficient number, since it is larger than the sum of its proper divisors (20098077664).

21423412112 is a wasteful number, since it uses less digits than its factorization.

21423412112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439646 (or 439640 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 21423412112 its reverse (21121432412), we get a palindrome (42544844524).

The spelling of 21423412112 in words is "twenty-one billion, four hundred twenty-three million, four hundred twelve thousand, one hundred twelve".