21100036 has 12 divisors (see below), whose sum is σ = 37013760. Its totient is φ = 10524680.

The previous prime is 21100033. The next prime is 21100049. The reversal of 21100036 is 63000112.

It is a junction number, because it is equal to n+sod(n) for n = 21099989 and 21100025.

It is not an unprimeable number, because it can be changed into a prime (21100033) 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, 4396 + ... + 7843.

It is an arithmetic number, because the mean of its divisors is an integer number (3084480).

Almost surely, 2^21100036 is an apocalyptic number.

It is an amenable number.

21100036 is a deficient number, since it is larger than the sum of its proper divisors (15913724).

21100036 is a wasteful number, since it uses less digits than its factorization.

21100036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12674 (or 12672 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21100036 is about 4593.4775497438. The cubic root of 21100036 is about 276.3298059797.

Adding to 21100036 its reverse (63000112), we get a palindrome (84100148).

The spelling of 21100036 in words is "twenty-one million, one hundred thousand, thirty-six".