21348519 has 16 divisors (see below), whose sum is σ = 29576160. Its totient is φ = 13685760.

The previous prime is 21348517. The next prime is 21348527. The reversal of 21348519 is 91584312.

It is not a de Polignac number, because 21348519 - 2¹ = 21348517 is a prime.

It is a super-2 number, since 2×21348519² = 911518526986722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21348519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348517) 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 15 ways as a sum of consecutive naturals, for example, 8799 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (1848510).

Almost surely, 2^21348519 is an apocalyptic number.

21348519 is a deficient number, since it is larger than the sum of its proper divisors (8227641).

21348519 is a wasteful number, since it uses less digits than its factorization.

21348519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290.

The product of its digits is 8640, while the sum is 33.

The square root of 21348519 is about 4620.4457577165. The cubic root of 21348519 is about 277.4103013394.

The spelling of 21348519 in words is "twenty-one million, three hundred forty-eight thousand, five hundred nineteen".