21132606 has 32 divisors (see below), whose sum is σ = 46368000. Its totient is φ = 6367680.

The previous prime is 21132599. The next prime is 21132611. The reversal of 21132606 is 60623112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12330 + ... + 13938.

It is an arithmetic number, because the mean of its divisors is an integer number (1449000).

Almost surely, 2^21132606 is an apocalyptic number.

21132606 is an abundant number, since it is smaller than the sum of its proper divisors (25235394).

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

21132606 is a wasteful number, since it uses less digits than its factorization.

21132606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21132606 is about 4597.0214269677. The cubic root of 21132606 is about 276.4719137138.

Adding to 21132606 its reverse (60623112), we get a palindrome (81755718).

The spelling of 21132606 in words is "twenty-one million, one hundred thirty-two thousand, six hundred six".