21319109 has 8 divisors (see below), whose sum is σ = 24557568. Its totient is φ = 18128880.

The previous prime is 21319097. The next prime is 21319127. The reversal of 21319109 is 90191312.

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

It is not a de Polignac number, because 21319109 - 2⁴ = 21319093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11102 + ... + 12879.

It is an arithmetic number, because the mean of its divisors is an integer number (3069696).

Almost surely, 2^21319109 is an apocalyptic number.

It is an amenable number.

21319109 is a deficient number, since it is larger than the sum of its proper divisors (3238459).

21319109 is a wasteful number, since it uses less digits than its factorization.

21319109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24115.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 21319109 is about 4617.2620675028. The cubic root of 21319109 is about 277.2828547733.

The spelling of 21319109 in words is "twenty-one million, three hundred nineteen thousand, one hundred nine".