21223112112 has 60 divisors (see below), whose sum is σ = 60231819024. Its totient is φ = 6974728320.

The previous prime is 21223112101. The next prime is 21223112117. The reversal of 21223112112 is 21121132212.

It is a super-2 number, since 2×21223112112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21223112117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1027683 + ... + 1048130.

Almost surely, 2^21223112112 is an apocalyptic number.

It is an amenable number.

21223112112 is an abundant number, since it is smaller than the sum of its proper divisors (39008706912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223112112 is a wasteful number, since it uses less digits than its factorization.

21223112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075898 (or 2075889 counting only the distinct ones).

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

Adding to 21223112112 its reverse (21121132212), we get a palindrome (42344244324).

The spelling of 21223112112 in words is "twenty-one billion, two hundred twenty-three million, one hundred twelve thousand, one hundred twelve".