21676236 has 12 divisors (see below), whose sum is σ = 50577912. Its totient is φ = 7225408.

The previous prime is 21676231. The next prime is 21676261. The reversal of 21676236 is 63267612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21676197 and 21676206.

It is not an unprimeable number, because it can be changed into a prime (21676231) 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, 903165 + ... + 903188.

It is an arithmetic number, because the mean of its divisors is an integer number (4214826).

Almost surely, 2^21676236 is an apocalyptic number.

It is an amenable number.

21676236 is an abundant number, since it is smaller than the sum of its proper divisors (28901676).

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

21676236 is a wasteful number, since it uses less digits than its factorization.

21676236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806360 (or 1806358 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 21676236 is about 4655.7744790743. The cubic root of 21676236 is about 278.8225899015.

It can be divided in two parts, 21676 and 236, that added together give a palindrome (21912).

The spelling of 21676236 in words is "twenty-one million, six hundred seventy-six thousand, two hundred thirty-six".