21340382 has 48 divisors (see below), whose sum is σ = 39986640. Its totient is φ = 8491392.

The previous prime is 21340381. The next prime is 21340387. The reversal of 21340382 is 28304312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135848 + ... + 136004.

It is an arithmetic number, because the mean of its divisors is an integer number (833055).

Almost surely, 2^21340382 is an apocalyptic number.

21340382 is a deficient number, since it is larger than the sum of its proper divisors (18646258).

21340382 is a wasteful number, since it uses less digits than its factorization.

21340382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21340382 is about 4619.5651310486. The cubic root of 21340382 is about 277.3750518299.

Adding to 21340382 its reverse (28304312), we get a palindrome (49644694).

The spelling of 21340382 in words is "twenty-one million, three hundred forty thousand, three hundred eighty-two".