221121201221210 has 16 divisors (see below), whose sum is σ = 402490276381800. Its totient is φ = 87454677336576.

The previous prime is 221121201221159. The next prime is 221121201221233. The reversal of 221121201221210 is 12122102121122.

It can be written as a sum of positive squares in 4 ways, for example, as 199284861015241 + 21836340205969 = 14116829^2 + 4672937^2 .

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, 124225393055 + ... + 124225394834.

Almost surely, 2^{221121201221210} is an apocalyptic number.

221121201221210 is a deficient number, since it is larger than the sum of its proper divisors (181369075160590).

221121201221210 is a wasteful number, since it uses less digits than its factorization.

221121201221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248450787985.

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

Adding to 221121201221210 its reverse (12122102121122), we get a palindrome (233243303342332).

The spelling of 221121201221210 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred ten".