21132105 has 32 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 10463232.

The previous prime is 21132103. The next prime is 21132119. The reversal of 21132105 is 50123112.

21132105 = 95² + 96² + ... + 400².

It is not a de Polignac number, because 21132105 - 2¹ = 21132103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21132103) 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 31 ways as a sum of consecutive naturals, for example, 19621 + ... + 20669.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^21132105 is an apocalyptic number.

It is an amenable number.

21132105 is a deficient number, since it is larger than the sum of its proper divisors (15155895).

21132105 is a wasteful number, since it uses less digits than its factorization.

21132105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21132105 is about 4596.9669348387. The cubic root of 21132105 is about 276.4697288827.

Adding to 21132105 its reverse (50123112), we get a palindrome (71255217).

The spelling of 21132105 in words is "twenty-one million, one hundred thirty-two thousand, one hundred five".