21202006 has 12 divisors (see below), whose sum is σ = 36995508. Its totient is φ = 9086532.

The previous prime is 21202003. The next prime is 21202033. The reversal of 21202006 is 60020212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108076 + ... + 108271.

It is an arithmetic number, because the mean of its divisors is an integer number (3082959).

Almost surely, 2^21202006 is an apocalyptic number.

21202006 is a deficient number, since it is larger than the sum of its proper divisors (15793502).

21202006 is a wasteful number, since it uses less digits than its factorization.

21202006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216363 (or 216356 counting only the distinct ones).

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

The square root of 21202006 is about 4604.5636058154. The cubic root of 21202006 is about 276.7742298812.

Adding to 21202006 its reverse (60020212), we get a palindrome (81222218).

The spelling of 21202006 in words is "twenty-one million, two hundred two thousand, six".