21063036 has 12 divisors (see below), whose sum is σ = 49147112. Its totient is φ = 7021008.

The previous prime is 21063013. The next prime is 21063041. The reversal of 21063036 is 63036012.

It is a tau number, because it is divible by the number of its divisors (12).

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, 877615 + ... + 877638.

Almost surely, 2^21063036 is an apocalyptic number.

It is an amenable number.

21063036 is an abundant number, since it is smaller than the sum of its proper divisors (28084076).

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

21063036 is a wasteful number, since it uses less digits than its factorization.

21063036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755260 (or 1755258 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 21063036 is about 4589.4483328609. The cubic root of 21063036 is about 276.1681919604.

Adding to 21063036 its reverse (63036012), we get a palindrome (84099048).

The spelling of 21063036 in words is "twenty-one million, sixty-three thousand, thirty-six".