221020222100210 has 48 divisors (see below), whose sum is σ = 430822282860360. Its totient is φ = 81601968913920.

The previous prime is 221020222100207. The next prime is 221020222100243. The reversal of 221020222100210 is 12001222020122.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 27324445743841 + 193695776356369 = 5227279^2 + 13917463^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20730830 + ... + 29526390.

Almost surely, 2^{221020222100210} is an apocalyptic number.

221020222100210 is a deficient number, since it is larger than the sum of its proper divisors (209802060760150).

221020222100210 is a wasteful number, since it uses less digits than its factorization.

221020222100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8810463 (or 8810450 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221020222100210 its reverse (12001222020122), we get a palindrome (233021444120332).

The spelling of 221020222100210 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-two million, one hundred thousand, two hundred ten".