21136036 has 12 divisors (see below), whose sum is σ = 37079280. Its totient is φ = 10541960.

The previous prime is 21136007. The next prime is 21136039. The reversal of 21136036 is 63063112.

It is a junction number, because it is equal to n+sod(n) for n = 21135998 and 21136016.

It is not an unprimeable number, because it can be changed into a prime (21136039) 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, 4630 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (3089940).

Almost surely, 2^21136036 is an apocalyptic number.

It is an amenable number.

21136036 is a deficient number, since it is larger than the sum of its proper divisors (15943244).

21136036 is a wasteful number, since it uses less digits than its factorization.

21136036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13034 (or 13032 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21136036 is about 4597.3944794851. The cubic root of 21136036 is about 276.4868708116.

Adding to 21136036 its reverse (63063112), we get a palindrome (84199148).

The spelling of 21136036 in words is "twenty-one million, one hundred thirty-six thousand, thirty-six".