221120021210 has 64 divisors (see below), whose sum is σ = 449378648064. Its totient is φ = 77609870400.

The previous prime is 221120021191. The next prime is 221120021219. The reversal of 221120021210 is 12120021122.

It is not an unprimeable number, because it can be changed into a prime (221120021219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1221377 + ... + 1390683.

It is an arithmetic number, because the mean of its divisors is an integer number (7021541376).

Almost surely, 2^221120021210 is an apocalyptic number.

221120021210 is an abundant number, since it is smaller than the sum of its proper divisors (228258626854).

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

221120021210 is a wasteful number, since it uses less digits than its factorization.

221120021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169739.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221120021210 its reverse (12120021122), we get a palindrome (233240042332).

The spelling of 221120021210 in words is "two hundred twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred ten".