221000121210 has 256 divisors, whose sum is σ = 619218432000. Its totient is φ = 49887129600.

The previous prime is 221000121203. The next prime is 221000121211. The reversal of 221000121210 is 12121000122.

It is not an unprimeable number, because it can be changed into a prime (221000121211) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 350237595 + ... + 350238225.

It is an arithmetic number, because the mean of its divisors is an integer number (2418822000).

Almost surely, 2^221000121210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221000121210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309609216000).

221000121210 is an abundant number, since it is smaller than the sum of its proper divisors (398218310790).

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

221000121210 is a wasteful number, since it uses less digits than its factorization.

221000121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221000121210 its reverse (12121000122), we get a palindrome (233121121332).

The spelling of 221000121210 in words is "two hundred twenty-one billion, one hundred twenty-one thousand, two hundred ten".