221111122121 has 8 divisors (see below), whose sum is σ = 221426879904. Its totient is φ = 220795482880.

The previous prime is 221111122103. The next prime is 221111122129. The reversal of 221111122121 is 121221111122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221111122121 - 2³⁴ = 203931252937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221111122121.

It is not an unprimeable number, because it can be changed into a prime (221111122129) 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, 4110761 + ... + 4164201.

It is an arithmetic number, because the mean of its divisors is an integer number (27678359988).

Almost surely, 2^221111122121 is an apocalyptic number.

It is an amenable number.

221111122121 is a deficient number, since it is larger than the sum of its proper divisors (315757783).

221111122121 is an equidigital number, since it uses as much as digits as its factorization.

221111122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59271.

The product of its digits is 32, while the sum is 17.

Adding to 221111122121 its reverse (121221111122), we get a palindrome (342332233243).

It can be divided in two parts, 221111122 and 121, that multiplied together give a palindrome (26754445762).

The spelling of 221111122121 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".