21102221002210 has 16 divisors (see below), whose sum is σ = 38360076991992. Its totient is φ = 8357315248000.

The previous prime is 21102221002171. The next prime is 21102221002229. The reversal of 21102221002210 is 1220012220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17489952045801 + 3612268956409 = 4182099^2 + 1900597^2 .

It is a super-2 number, since 2×21102221002210² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10446643051 + ... + 10446645070.

Almost surely, 2^{21102221002210} is an apocalyptic number.

21102221002210 is a deficient number, since it is larger than the sum of its proper divisors (17257855989782).

21102221002210 is a wasteful number, since it uses less digits than its factorization.

21102221002210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20893288229.

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

Adding to 21102221002210 its reverse (1220012220112), we get a palindrome (22322233222322).

The spelling of 21102221002210 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-one million, two thousand, two hundred ten".