221221211202110 has 16 divisors (see below), whose sum is σ = 455083634473056. Its totient is φ = 75847272412128.

The previous prime is 221221211202109. The next prime is 221221211202119. The reversal of 221221211202110 is 11202112122122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221211202119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580151508517 + ... + 1580151508656.

It is an arithmetic number, because the mean of its divisors is an integer number (28442727154566).

Almost surely, 2^{221221211202110} is an apocalyptic number.

221221211202110 is an abundant number, since it is smaller than the sum of its proper divisors (233862423270946).

221221211202110 is a wasteful number, since it uses less digits than its factorization.

221221211202110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160303017187.

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

Adding to 221221211202110 its reverse (11202112122122), we get a palindrome (232423323324232).

The spelling of 221221211202110 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred ten".