21143112 has 32 divisors (see below), whose sum is σ = 53102400. Its totient is φ = 7015104.

The previous prime is 21143081. The next prime is 21143113. The reversal of 21143112 is 21134112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21143091 and 21143100.

It is not an unprimeable number, because it can be changed into a prime (21143113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3573 + ... + 7419.

It is an arithmetic number, because the mean of its divisors is an integer number (1659450).

Almost surely, 2^21143112 is an apocalyptic number.

It is an amenable number.

21143112 is an abundant number, since it is smaller than the sum of its proper divisors (31959288).

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

21143112 is a wasteful number, since it uses less digits than its factorization.

21143112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085 (or 4081 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 21143112 is about 4598.1639814169. The cubic root of 21143112 is about 276.5177218001.

Adding to 21143112 its reverse (21134112), we get a palindrome (42277224).

The spelling of 21143112 in words is "twenty-one million, one hundred forty-three thousand, one hundred twelve".