21006202 has 24 divisors (see below), whose sum is σ = 37182240. Its totient is φ = 8872920.

The previous prime is 21006163. The next prime is 21006217. The reversal of 21006202 is 20260012.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 5449 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (1549260).

Almost surely, 2^21006202 is an apocalyptic number.

21006202 is a deficient number, since it is larger than the sum of its proper divisors (16176038).

21006202 is a wasteful number, since it uses less digits than its factorization.

21006202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21006202 is about 4583.2523386783. The cubic root of 21006202 is about 275.9195750406.

Adding to 21006202 its reverse (20260012), we get a palindrome (41266214).

The spelling of 21006202 in words is "twenty-one million, six thousand, two hundred two".