221201111010 has 128 divisors (see below), whose sum is σ = 603748712448. Its totient is φ = 51380640000.

The previous prime is 221201110997. The next prime is 221201111029. The reversal of 221201111010 is 10111102122.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 926187 + ... + 1140273.

It is an arithmetic number, because the mean of its divisors is an integer number (4716786816).

Almost surely, 2^221201111010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221201111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301874356224).

221201111010 is an abundant number, since it is smaller than the sum of its proper divisors (382547601438).

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

221201111010 is a wasteful number, since it uses less digits than its factorization.

221201111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214240.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221201111010 its reverse (10111102122), we get a palindrome (231312213132).

The spelling of 221201111010 in words is "two hundred twenty-one billion, two hundred one million, one hundred eleven thousand, ten".