21363718 has 4 divisors (see below), whose sum is σ = 32045580. Its totient is φ = 10681858.

The previous prime is 21363703. The next prime is 21363739. The reversal of 21363718 is 81736312.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21363718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5340928 + ... + 5340931.

It is an arithmetic number, because the mean of its divisors is an integer number (8011395).

Almost surely, 2^21363718 is an apocalyptic number.

21363718 is a deficient number, since it is larger than the sum of its proper divisors (10681862).

21363718 is a wasteful number, since it uses less digits than its factorization.

21363718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681861.

The product of its digits is 6048, while the sum is 31.

The square root of 21363718 is about 4622.0902198032. The cubic root of 21363718 is about 277.4761194719.

The spelling of 21363718 in words is "twenty-one million, three hundred sixty-three thousand, seven hundred eighteen".