21050036 has 12 divisors (see below), whose sum is σ = 42100128. Its totient is φ = 9021432.

The previous prime is 21050033. The next prime is 21050053. The reversal of 21050036 is 63005012.

21050036 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21049996 and 21050023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050033) 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, 375866 + ... + 375921.

It is an arithmetic number, because the mean of its divisors is an integer number (3508344).

Almost surely, 2^21050036 is an apocalyptic number.

It is an amenable number.

21050036 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21050036 is a wasteful number, since it uses less digits than its factorization.

21050036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751798 (or 751796 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21050036 is about 4588.0318220344. The cubic root of 21050036 is about 276.1113637273. Note that the first 3 decimals are identical.

Adding to 21050036 its reverse (63005012), we get a palindrome (84055048).

The spelling of 21050036 in words is "twenty-one million, fifty thousand, thirty-six".