21210682 has 8 divisors (see below), whose sum is σ = 32264352. Its totient is φ = 10455900.

The previous prime is 21210649. The next prime is 21210691. The reversal of 21210682 is 28601212.

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

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, 74544 + ... + 74827.

It is an arithmetic number, because the mean of its divisors is an integer number (4033044).

Almost surely, 2^21210682 is an apocalyptic number.

21210682 is a deficient number, since it is larger than the sum of its proper divisors (11053670).

21210682 is a wasteful number, since it uses less digits than its factorization.

21210682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149444.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 21210682 is about 4605.5056182791. The cubic root of 21210682 is about 276.8119773432.

Adding to 21210682 its reverse (28601212), we get a palindrome (49811894).

The spelling of 21210682 in words is "twenty-one million, two hundred ten thousand, six hundred eighty-two".