21675318 has 32 divisors (see below), whose sum is σ = 49918464. Its totient is φ = 6146112.

The previous prime is 21675301. The next prime is 21675331. The reversal of 21675318 is 81357612.

It is a super-2 number, since 2×21675318² = 939638820802248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871 + ... + 7637.

It is an arithmetic number, because the mean of its divisors is an integer number (1559952).

Almost surely, 2^21675318 is an apocalyptic number.

21675318 is an abundant number, since it is smaller than the sum of its proper divisors (28243146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21675318 is a wasteful number, since it uses less digits than its factorization.

21675318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its digits is 10080, while the sum is 33.

The square root of 21675318 is about 4655.6758907811. The cubic root of 21675318 is about 278.8186537514.

The spelling of 21675318 in words is "twenty-one million, six hundred seventy-five thousand, three hundred eighteen".