221100211221210 has 24 divisors (see below), whose sum is σ = 574860549175380. Its totient is φ = 58960056325632.

The previous prime is 221100211221157. The next prime is 221100211221221. The reversal of 221100211221210 is 12122112001122.

221100211221210 is a `hidden beast` number, since 2 + 21 + 1 + 0 + 0 + 211 + 221 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 182998640234601 + 38101570986609 = 13527699^2 + 6172647^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1228334506695 + ... + 1228334506874.

Almost surely, 2^{221100211221210} is an apocalyptic number.

221100211221210 is an abundant number, since it is smaller than the sum of its proper divisors (353760337954170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221100211221210 is a wasteful number, since it uses less digits than its factorization.

221100211221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456669013582 (or 2456669013579 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221100211221210 its reverse (12122112001122), we get a palindrome (233222323222332).

The spelling of 221100211221210 in words is "two hundred twenty-one trillion, one hundred billion, two hundred eleven million, two hundred twenty-one thousand, two hundred ten".