21201132 has 12 divisors (see below), whose sum is σ = 49469336. Its totient is φ = 7067040.

The previous prime is 21201127. The next prime is 21201133. The reversal of 21201132 is 23110212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1766761 = 21201132 / (2 + 1 + 2 + 0 + 1 + 1 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (21201133) 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, 883369 + ... + 883392.

Almost surely, 2^21201132 is an apocalyptic number.

It is an amenable number.

21201132 is an abundant number, since it is smaller than the sum of its proper divisors (28268204).

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

21201132 is a wasteful number, since it uses less digits than its factorization.

21201132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766768 (or 1766766 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21201132 is about 4604.4686989923. The cubic root of 21201132 is about 276.7704267190.

Adding to 21201132 its reverse (23110212), we get a palindrome (44311344).

The spelling of 21201132 in words is "twenty-one million, two hundred one thousand, one hundred thirty-two".