21202112210 has 32 divisors (see below), whose sum is σ = 38808342000. Its totient is φ = 8337749760.

The previous prime is 21202112201. The next prime is 21202112221. The reversal of 21202112210 is 1221120212.

It can be written as a sum of positive squares in 8 ways, for example, as 4046613769 + 17155498441 = 63613^2 + 130979^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1450016 + ... + 1464564.

Almost surely, 2^21202112210 is an apocalyptic number.

21202112210 is a deficient number, since it is larger than the sum of its proper divisors (17606229790).

21202112210 is a wasteful number, since it uses less digits than its factorization.

21202112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17006.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202112210 its reverse (1221120212), we get a palindrome (22423232422).

The spelling of 21202112210 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred ten".