111001202212121 has 6 divisors (see below), whose sum is σ = 120196568076030. Its totient is φ = 102462648195648.

The previous prime is 111001202212091. The next prime is 111001202212133. The reversal of 111001202212121 is 121212202100111.

It can be written as a sum of positive squares in 3 ways, for example, as 2827993808896 + 108173208403225 = 1681664^2 + 10400635^2 .

It is not a de Polignac number, because 111001202212121 - 2⁶ = 111001202212057 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 111001202212121.

It is not an unprimeable number, because it can be changed into a prime (111001202212141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328405923536 + ... + 328405923873.

It is an arithmetic number, because the mean of its divisors is an integer number (20032761346005).

Almost surely, 2^{111001202212121} is an apocalyptic number.

It is an amenable number.

111001202212121 is a deficient number, since it is larger than the sum of its proper divisors (9195365863909).

111001202212121 is an equidigital number, since it uses as much as digits as its factorization.

111001202212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656811847435 (or 656811847422 counting only the distinct ones).

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

Adding to 111001202212121 its reverse (121212202100111), we get a palindrome (232213404312232).

The spelling of 111001202212121 in words is "one hundred eleven trillion, one billion, two hundred two million, two hundred twelve thousand, one hundred twenty-one".