21340582 has 16 divisors (see below), whose sum is σ = 33142032. Its totient is φ = 10298880.

The previous prime is 21340567. The next prime is 21340597. The reversal of 21340582 is 28504312.

It is an interprime number because it is at equal distance from previous prime (21340567) and next prime (21340597).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6613 + ... + 9295.

It is an arithmetic number, because the mean of its divisors is an integer number (2071377).

Almost surely, 2^21340582 is an apocalyptic number.

21340582 is a deficient number, since it is larger than the sum of its proper divisors (11801450).

21340582 is a wasteful number, since it uses less digits than its factorization.

21340582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21340582 is about 4619.5867780571. The cubic root of 21340582 is about 277.3759183379.

Adding to 21340582 its reverse (28504312), we get a palindrome (49844894).

The spelling of 21340582 in words is "twenty-one million, three hundred forty thousand, five hundred eighty-two".