21676364 has 24 divisors (see below), whose sum is σ = 39327120. Its totient is φ = 10447424.

The previous prime is 21676351. The next prime is 21676367. The reversal of 21676364 is 46367612.

It is not an unprimeable number, because it can be changed into a prime (21676367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11642 + ... + 13374.

It is an arithmetic number, because the mean of its divisors is an integer number (1638630).

Almost surely, 2^21676364 is an apocalyptic number.

It is an amenable number.

21676364 is a deficient number, since it is larger than the sum of its proper divisors (17650756).

21676364 is a wasteful number, since it uses less digits than its factorization.

21676364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1847 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 21676364 is about 4655.7882254243. The cubic root of 21676364 is about 278.8231387240.

The spelling of 21676364 in words is "twenty-one million, six hundred seventy-six thousand, three hundred sixty-four".