21542112 has 60 divisors (see below), whose sum is σ = 63362376. Its totient is φ = 7179840.

The previous prime is 21542093. The next prime is 21542119. The reversal of 21542112 is 21124512.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542119) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1564 + ... + 6747.

Almost surely, 2^21542112 is an apocalyptic number.

It is an amenable number.

21542112 is an abundant number, since it is smaller than the sum of its proper divisors (41820264).

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

21542112 is an equidigital number, since it uses as much as digits as its factorization.

21542112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333 (or 8316 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21542112 is about 4641.3480800302. The cubic root of 21542112 is about 278.2463182721.

Adding to 21542112 its reverse (21124512), we get a palindrome (42666624).

The spelling of 21542112 in words is "twenty-one million, five hundred forty-two thousand, one hundred twelve".