21836308 has 12 divisors (see below), whose sum is σ = 41153140. Its totient is φ = 10078272.

The previous prime is 21836273. The next prime is 21836323. The reversal of 21836308 is 80363812.

It can be written as a sum of positive squares in 2 ways, for example, as 14961424 + 6874884 = 3868^2 + 2622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21836308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209913 + ... + 210016.

Almost surely, 2^21836308 is an apocalyptic number.

It is an amenable number.

21836308 is a deficient number, since it is larger than the sum of its proper divisors (19316832).

21836308 is a wasteful number, since it uses less digits than its factorization.

21836308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419946 (or 419944 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21836308 is about 4672.9335539894. The cubic root of 21836308 is about 279.5072455860.

The spelling of 21836308 in words is "twenty-one million, eight hundred thirty-six thousand, three hundred eight".