221021020110 has 128 divisors (see below), whose sum is σ = 605550836736. Its totient is φ = 51105443840.

The previous prime is 221021020081. The next prime is 221021020117. The reversal of 221021020110 is 11020120122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021020117) 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 63 ways as a sum of consecutive naturals, for example, 2638024 + ... + 2720516.

It is an arithmetic number, because the mean of its divisors is an integer number (4730865912).

Almost surely, 2^221021020110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221021020110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302775418368).

221021020110 is an abundant number, since it is smaller than the sum of its proper divisors (384529816626).

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

221021020110 is a wasteful number, since it uses less digits than its factorization.

221021020110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82890.

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

Adding to 221021020110 its reverse (11020120122), we get a palindrome (232041140232).

The spelling of 221021020110 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, one hundred ten".