21112632 has 48 divisors (see below), whose sum is σ = 57788640. Its totient is φ = 6962688.

The previous prime is 21112601. The next prime is 21112633. The reversal of 21112632 is 23621112.

21112632 is a `hidden beast` number, since 21 + 1 + 12 + 632 = 666.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112633) 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, 5473 + ... + 8495.

It is an arithmetic number, because the mean of its divisors is an integer number (1203930).

Almost surely, 2^21112632 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 21112632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28894320).

21112632 is an abundant number, since it is smaller than the sum of its proper divisors (36676008).

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

21112632 is a wasteful number, since it uses less digits than its factorization.

21112632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132 (or 3125 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 21112632 is about 4594.8484196979. The cubic root of 21112632 is about 276.3847815234.

Adding to 21112632 its reverse (23621112), we get a palindrome (44733744).

The spelling of 21112632 in words is "twenty-one million, one hundred twelve thousand, six hundred thirty-two".