21340326 has 16 divisors (see below), whose sum is σ = 48777984. Its totient is φ = 6097224.

The previous prime is 21340313. The next prime is 21340327. The reversal of 21340326 is 62304312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340327) 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, 254010 + ... + 254093.

It is an arithmetic number, because the mean of its divisors is an integer number (3048624).

Almost surely, 2^21340326 is an apocalyptic number.

21340326 is an abundant number, since it is smaller than the sum of its proper divisors (27437658).

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

21340326 is a wasteful number, since it uses less digits than its factorization.

21340326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508115.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21340326 is about 4619.5590698680. The cubic root of 21340326 is about 277.3748092067.

Adding to 21340326 its reverse (62304312), we get a palindrome (83644638).

The spelling of 21340326 in words is "twenty-one million, three hundred forty thousand, three hundred twenty-six".