21043132 has 12 divisors (see below), whose sum is σ = 40173336. Its totient is φ = 9565040.

The previous prime is 21043129. The next prime is 21043133. The reversal of 21043132 is 23134012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239083 + ... + 239170.

It is an arithmetic number, because the mean of its divisors is an integer number (3347778).

Almost surely, 2^21043132 is an apocalyptic number.

21043132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21043132 is a deficient number, since it is larger than the sum of its proper divisors (19130204).

21043132 is a wasteful number, since it uses less digits than its factorization.

21043132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478268 (or 478266 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21043132 is about 4587.2793679914. The cubic root of 21043132 is about 276.0811740513.

Adding to 21043132 its reverse (23134012), we get a palindrome (44177144).

The spelling of 21043132 in words is "twenty-one million, forty-three thousand, one hundred thirty-two".