221221201112112 has 160 divisors (see below), whose sum is σ = 594716058593280. Its totient is φ = 70773681341440.

The previous prime is 221221201112063. The next prime is 221221201112123. The reversal of 221221201112112 is 211211102122122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1427238937 + ... + 1427393927.

It is an arithmetic number, because the mean of its divisors is an integer number (3716975366208).

Almost surely, 2^{221221201112112} 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 221221201112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297358029296640).

221221201112112 is an abundant number, since it is smaller than the sum of its proper divisors (373494857481168).

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

221221201112112 is a wasteful number, since it uses less digits than its factorization.

221221201112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161131 (or 161125 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221221201112112 its reverse (211211102122122), we get a palindrome (432432303234234).

The spelling of 221221201112112 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred twelve".