21332109 has 16 divisors (see below), whose sum is σ = 29983104. Its totient is φ = 13464000.

The previous prime is 21332089. The next prime is 21332119. The reversal of 21332109 is 90123312.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21332109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5439 + ... + 8499.

It is an arithmetic number, because the mean of its divisors is an integer number (1873944).

Almost surely, 2^21332109 is an apocalyptic number.

It is an amenable number.

21332109 is a deficient number, since it is larger than the sum of its proper divisors (8650995).

21332109 is a wasteful number, since it uses less digits than its factorization.

21332109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21332109 is about 4618.6696136442. The cubic root of 21332109 is about 277.3392039805.

The spelling of 21332109 in words is "twenty-one million, three hundred thirty-two thousand, one hundred nine".