221021210112 has 80 divisors (see below), whose sum is σ = 589117056000. Its totient is φ = 73635858432.

The previous prime is 221021210107. The next prime is 221021210117. The reversal of 221021210112 is 211012120122.

It is an interprime number because it is at equal distance from previous prime (221021210107) and next prime (221021210117).

It is a junction number, because it is equal to n+sod(n) for n = 221021210091 and 221021210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021210117) 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, 3034473 + ... + 3106455.

It is an arithmetic number, because the mean of its divisors is an integer number (7363963200).

Almost surely, 2^221021210112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221021210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294558528000).

221021210112 is an abundant number, since it is smaller than the sum of its proper divisors (368095845888).

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

221021210112 is an equidigital number, since it uses as much as digits as its factorization.

221021210112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74003 (or 73987 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021210112 its reverse (211012120122), we get a palindrome (432033330234).

The spelling of 221021210112 in words is "two hundred twenty-one billion, twenty-one million, two hundred ten thousand, one hundred twelve".