21065502 has 16 divisors (see below), whose sum is σ = 42262272. Its totient is φ = 6999960.

The previous prime is 21065501. The next prime is 21065549. The reversal of 21065502 is 20556012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3318 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (2641392).

Almost surely, 2^21065502 is an apocalyptic number.

21065502 is an abundant number, since it is smaller than the sum of its proper divisors (21196770).

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

21065502 is a wasteful number, since it uses less digits than its factorization.

21065502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10943.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21065502 is about 4589.7169847388. The cubic root of 21065502 is about 276.1789692005.

The spelling of 21065502 in words is "twenty-one million, sixty-five thousand, five hundred two".