21145832 has 32 divisors (see below), whose sum is σ = 42396480. Its totient is φ = 9863040.

The previous prime is 21145829. The next prime is 21145871. The reversal of 21145832 is 23854112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6143 + ... + 8945.

It is an arithmetic number, because the mean of its divisors is an integer number (1324890).

Almost surely, 2^21145832 is an apocalyptic number.

It is an amenable number.

21145832 is an abundant number, since it is smaller than the sum of its proper divisors (21250648).

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

21145832 is a wasteful number, since it uses less digits than its factorization.

21145832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873 (or 2869 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21145832 is about 4598.4597421311. The cubic root of 21145832 is about 276.5295790258.

Adding to 21145832 its reverse (23854112), we get a palindrome (44999944).

The spelling of 21145832 in words is "twenty-one million, one hundred forty-five thousand, eight hundred thirty-two".