21143132 has 24 divisors (see below), whose sum is σ = 38201856. Its totient is φ = 10231488.

The previous prime is 21143113. The next prime is 21143137. The reversal of 21143132 is 23134112.

It is a self number, because there is not a number n which added to its sum of digits gives 21143132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55013 + ... + 55395.

It is an arithmetic number, because the mean of its divisors is an integer number (1591744).

Almost surely, 2^21143132 is an apocalyptic number.

It is an amenable number.

21143132 is a deficient number, since it is larger than the sum of its proper divisors (17058724).

21143132 is a wasteful number, since it uses less digits than its factorization.

21143132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 21143132 is about 4598.1661561975. The cubic root of 21143132 is about 276.5178089893.

Adding to 21143132 its reverse (23134112), we get a palindrome (44277244).

The spelling of 21143132 in words is "twenty-one million, one hundred forty-three thousand, one hundred thirty-two".