21636196 has 6 divisors (see below), whose sum is σ = 37863350. Its totient is φ = 10818096.

The previous prime is 21636187. The next prime is 21636203. The reversal of 21636196 is 69163612.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 1060900 = 4536^2 + 1030^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2704521 + ... + 2704528.

Almost surely, 2^21636196 is an apocalyptic number.

It is an amenable number.

21636196 is a deficient number, since it is larger than the sum of its proper divisors (16227154).

21636196 is a wasteful number, since it uses less digits than its factorization.

21636196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5409053 (or 5409051 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 21636196 is about 4651.4724550404. The cubic root of 21636196 is about 278.6508051939.

The spelling of 21636196 in words is "twenty-one million, six hundred thirty-six thousand, one hundred ninety-six".