21319126 has 4 divisors (see below), whose sum is σ = 31978692. Its totient is φ = 10659562.

The previous prime is 21319097. The next prime is 21319127. The reversal of 21319126 is 62191312.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21319126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319127) by changing a digit.

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 as a sum of consecutive naturals, namely, 5329780 + ... + 5329783.

It is an arithmetic number, because the mean of its divisors is an integer number (7994673).

Almost surely, 2^21319126 is an apocalyptic number.

21319126 is a deficient number, since it is larger than the sum of its proper divisors (10659566).

21319126 is a wasteful number, since it uses less digits than its factorization.

21319126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10659565.

The product of its digits is 648, while the sum is 25.

The square root of 21319126 is about 4617.2639084202. The cubic root of 21319126 is about 277.2829284757.

The spelling of 21319126 in words is "twenty-one million, three hundred nineteen thousand, one hundred twenty-six".