21102201202210 has 32 divisors (see below), whose sum is σ = 38116579659120. Its totient is φ = 8411425870848.

The previous prime is 21102201202171. The next prime is 21102201202211. The reversal of 21102201202210 is 1220210220112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 14985082297249 + 6117118904961 = 3871057^2 + 2473281^2 .

It is not an unprimeable number, because it can be changed into a prime (21102201202211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9612894 + ... + 11602246.

Almost surely, 2^{21102201202210} is an apocalyptic number.

21102201202210 is a deficient number, since it is larger than the sum of its proper divisors (17014378456910).

21102201202210 is a wasteful number, since it uses less digits than its factorization.

21102201202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993062.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102201202210 its reverse (1220210220112), we get a palindrome (22322411422322).

The spelling of 21102201202210 in words is "twenty-one trillion, one hundred two billion, two hundred one million, two hundred two thousand, two hundred ten".