21540682 has 8 divisors (see below), whose sum is σ = 32337216. Its totient is φ = 10761612.

The previous prime is 21540679. The next prime is 21540709. The reversal of 21540682 is 28604512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21540682.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648 + ... + 6595.

It is an arithmetic number, because the mean of its divisors is an integer number (4042152).

Almost surely, 2^21540682 is an apocalyptic number.

21540682 is a deficient number, since it is larger than the sum of its proper divisors (10796534).

21540682 is a wasteful number, since it uses less digits than its factorization.

21540682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8732.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21540682 is about 4641.1940274029. The cubic root of 21540682 is about 278.2401613234.

It can be divided in two parts, 21540 and 682, that added together give a palindrome (22222).

The spelling of 21540682 in words is "twenty-one million, five hundred forty thousand, six hundred eighty-two".