21318076 has 24 divisors (see below), whose sum is σ = 42292880. Its totient is φ = 9320832.

The previous prime is 21318047. The next prime is 21318091. The reversal of 21318076 is 67081312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9801 + ... + 11776.

Almost surely, 2^21318076 is an apocalyptic number.

21318076 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21318076 is a deficient number, since it is larger than the sum of its proper divisors (20974804).

21318076 is a wasteful number, since it uses less digits than its factorization.

21318076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21613 (or 21611 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21318076 is about 4617.1502033181. The cubic root of 21318076 is about 277.2783761963.

Adding to 21318076 its reverse (67081312), we get a palindrome (88399388).

The spelling of 21318076 in words is "twenty-one million, three hundred eighteen thousand, seventy-six".