21452132 has 24 divisors (see below), whose sum is σ = 40855416. Its totient is φ = 9796608.

The previous prime is 21452131. The next prime is 21452149. The reversal of 21452132 is 23125412.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 21381376 = 266^2 + 4624^2 .

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21452131) 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, 2918 + ... + 7170.

It is an arithmetic number, because the mean of its divisors is an integer number (1702309).

Almost surely, 2^21452132 is an apocalyptic number.

It is an amenable number.

21452132 is a deficient number, since it is larger than the sum of its proper divisors (19403284).

21452132 is a wasteful number, since it uses less digits than its factorization.

21452132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4367 (or 4365 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21452132 is about 4631.6446323093. The cubic root of 21452132 is about 277.8583720394.

Adding to 21452132 its reverse (23125412), we get a palindrome (44577544).

The spelling of 21452132 in words is "twenty-one million, four hundred fifty-two thousand, one hundred thirty-two".