111221212222121 has 8 divisors (see below), whose sum is σ = 111263905456704. Its totient is φ = 111178526442480.

The previous prime is 111221212222079. The next prime is 111221212222163. The reversal of 111221212222121 is 121222212122111.

It is an interprime number because it is at equal distance from previous prime (111221212222079) and next prime (111221212222163).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221212222121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111221212225121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28072436 + ... + 31788426.

It is an arithmetic number, because the mean of its divisors is an integer number (13907988182088).

Almost surely, 2^{111221212222121} is an apocalyptic number.

It is an amenable number.

111221212222121 is a deficient number, since it is larger than the sum of its proper divisors (42693234583).

111221212222121 is an equidigital number, since it uses as much as digits as its factorization.

111221212222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727471.

The product of its digits is 256, while the sum is 23.

Adding to 111221212222121 its reverse (121222212122111), we get a palindrome (232443424344232).

The spelling of 111221212222121 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".