221121212212210 has 64 divisors (see below), whose sum is σ = 424530234777600. Its totient is φ = 82634154808320.

The previous prime is 221121212212171. The next prime is 221121212212339. The reversal of 221121212212210 is 12212212121122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36906655 + ... + 42477565.

It is an arithmetic number, because the mean of its divisors is an integer number (6633284918400).

Almost surely, 2^{221121212212210} is an apocalyptic number.

221121212212210 is a deficient number, since it is larger than the sum of its proper divisors (203409022565390).

221121212212210 is a wasteful number, since it uses less digits than its factorization.

221121212212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5572651.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221121212212210 its reverse (12212212121122), we get a palindrome (233333424333332).

The spelling of 221121212212210 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, two hundred ten".