21427112 has 48 divisors (see below), whose sum is σ = 47770560. Its totient is φ = 8979936.

The previous prime is 21427103. The next prime is 21427121. The reversal of 21427112 is 21172412.

It is an interprime number because it is at equal distance from previous prime (21427103) and next prime (21427121).

It is a super-2 number, since 2×21427112² = 918242257321088, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17843 + ... + 19005.

It is an arithmetic number, because the mean of its divisors is an integer number (995220).

Almost surely, 2^21427112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21427112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23885280).

21427112 is an abundant number, since it is smaller than the sum of its proper divisors (26343448).

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

21427112 is a wasteful number, since it uses less digits than its factorization.

21427112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230 (or 1219 counting only the distinct ones).

The product of its digits is 224, while the sum is 20.

The square root of 21427112 is about 4628.9428598763. The cubic root of 21427112 is about 277.7503063084.

Adding to 21427112 its reverse (21172412), we get a palindrome (42599524).

The spelling of 21427112 in words is "twenty-one million, four hundred twenty-seven thousand, one hundred twelve".