21163682 has 8 divisors (see below), whose sum is σ = 33416400. Its totient is φ = 10024884.

The previous prime is 21163643. The next prime is 21163687. The reversal of 21163682 is 28636112.

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

It is not an unprimeable number, because it can be changed into a prime (21163687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278432 + ... + 278507.

It is an arithmetic number, because the mean of its divisors is an integer number (4177050).

Almost surely, 2^21163682 is an apocalyptic number.

21163682 is a deficient number, since it is larger than the sum of its proper divisors (12252718).

21163682 is a wasteful number, since it uses less digits than its factorization.

21163682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556960.

The product of its digits is 3456, while the sum is 29.

The square root of 21163682 is about 4600.4001999826. The cubic root of 21163682 is about 276.6073668492.

Adding to 21163682 its reverse (28636112), we get a palindrome (49799794).

The spelling of 21163682 in words is "twenty-one million, one hundred sixty-three thousand, six hundred eighty-two".