21532113 has 12 divisors (see below), whose sum is σ = 31943028. Its totient is φ = 13966560.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532113 is 31123512.

21532113 is a `hidden beast` number, since 21 + 532 + 113 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8485569 + 13046544 = 2913^2 + 3612^2 .

It is not a de Polignac number, because 21532113 - 2⁴ = 21532097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21532513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31998 + ... + 32663.

It is an arithmetic number, because the mean of its divisors is an integer number (2661919).

Almost surely, 2^21532113 is an apocalyptic number.

It is an amenable number.

21532113 is a deficient number, since it is larger than the sum of its proper divisors (10410915).

21532113 is a wasteful number, since it uses less digits than its factorization.

21532113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64704 (or 64701 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 21532113 is about 4640.2707895122. The cubic root of 21532113 is about 278.2032612821.

Adding to 21532113 its reverse (31123512), we get a palindrome (52655625).

The spelling of 21532113 in words is "twenty-one million, five hundred thirty-two thousand, one hundred thirteen".