21132113 has 8 divisors (see below), whose sum is σ = 21588168. Its totient is φ = 20680704.

The previous prime is 21132103. The next prime is 21132119. The reversal of 21132113 is 31123112.

It can be written as a sum of positive squares in 4 ways, for example, as 183184 + 20948929 = 428^2 + 4577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132113 - 2¹² = 21128017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132119) 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 7 ways as a sum of consecutive naturals, for example, 8945 + ... + 11057.

It is an arithmetic number, because the mean of its divisors is an integer number (2698521).

Almost surely, 2^21132113 is an apocalyptic number.

It is an amenable number.

21132113 is a deficient number, since it is larger than the sum of its proper divisors (456055).

21132113 is a wasteful number, since it uses less digits than its factorization.

21132113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323.

The product of its digits is 36, while the sum is 14.

The square root of 21132113 is about 4596.9678049775. The cubic root of 21132113 is about 276.4697637705.

Adding to 21132113 its reverse (31123112), we get a palindrome (52255225).

Subtracting 21132113 from its reverse (31123112), we obtain a palindrome (9990999).

The spelling of 21132113 in words is "twenty-one million, one hundred thirty-two thousand, one hundred thirteen".