21201202210 has 16 divisors (see below), whose sum is σ = 38191747392. Its totient is φ = 8473906800.

The previous prime is 21201202207. The next prime is 21201202241. The reversal of 21201202210 is 1220210212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808206 + ... + 834025.

It is an arithmetic number, because the mean of its divisors is an integer number (2386984212).

Almost surely, 2^21201202210 is an apocalyptic number.

21201202210 is a deficient number, since it is larger than the sum of its proper divisors (16990545182).

21201202210 is a wasteful number, since it uses less digits than its factorization.

21201202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643529.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201202210 its reverse (1220210212), we get a palindrome (22421412422).

The spelling of 21201202210 in words is "twenty-one billion, two hundred one million, two hundred two thousand, two hundred ten".