221121212120210 has 32 divisors (see below), whose sum is σ = 404754542680752. Its totient is φ = 86953031700480.

The previous prime is 221121212120197. The next prime is 221121212120219. The reversal of 221121212120210 is 12021212121122.

It can be written as a sum of positive squares in 8 ways, for example, as 140993847090889 + 80127365029321 = 11874083^2 + 8951389^2 .

It is not an unprimeable number, because it can be changed into a prime (221121212120219) 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, 93577919 + ... + 95911778.

Almost surely, 2^{221121212120210} is an apocalyptic number.

221121212120210 is a deficient number, since it is larger than the sum of its proper divisors (183633330560542).

221121212120210 is a wasteful number, since it uses less digits than its factorization.

221121212120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189491678.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221121212120210 its reverse (12021212121122), we get a palindrome (233142424241332).

The spelling of 221121212120210 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred ten".