221031121113 has 72 divisors (see below), whose sum is σ = 374143798080. Its totient is φ = 129337780320.

The previous prime is 221031121099. The next prime is 221031121163. The reversal of 221031121113 is 311121130122.

221031121113 is a `hidden beast` number, since 221 + 0 + 311 + 21 + 113 = 666.

It is not a de Polignac number, because 221031121113 - 2⁴ = 221031121097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221031121163) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2040156 + ... + 2145762.

It is an arithmetic number, because the mean of its divisors is an integer number (5196441640).

Almost surely, 2^221031121113 is an apocalyptic number.

It is an amenable number.

221031121113 is a deficient number, since it is larger than the sum of its proper divisors (153112676967).

221031121113 is an equidigital number, since it uses as much as digits as its factorization.

221031121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105671 (or 105650 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 221031121113 its reverse (311121130122), we get a palindrome (532152251235).

Subtracting 221031121113 from its reverse (311121130122), we obtain a palindrome (90090009009).

The spelling of 221031121113 in words is "two hundred twenty-one billion, thirty-one million, one hundred twenty-one thousand, one hundred thirteen".