21165202 has 16 divisors (see below), whose sum is σ = 34198560. Its totient is φ = 9791712.

The previous prime is 21165197. The next prime is 21165227. The reversal of 21165202 is 20256112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21165202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4843 + ... + 8110.

It is an arithmetic number, because the mean of its divisors is an integer number (2137410).

Almost surely, 2^21165202 is an apocalyptic number.

21165202 is a deficient number, since it is larger than the sum of its proper divisors (13033358).

21165202 is a wasteful number, since it uses less digits than its factorization.

21165202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13017.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21165202 is about 4600.5654000351. The cubic root of 21165202 is about 276.6139887771.

The spelling of 21165202 in words is "twenty-one million, one hundred sixty-five thousand, two hundred two".