111010212121 has 8 divisors (see below), whose sum is σ = 116784561600. Its totient is φ = 105365623440.

The previous prime is 111010212119. The next prime is 111010212127. The reversal of 111010212121 is 121212010111.

It is a happy number.

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

It is not a de Polignac number, because 111010212121 - 2¹ = 111010212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111010212127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32438445 + ... + 32441866.

It is an arithmetic number, because the mean of its divisors is an integer number (14598070200).

Almost surely, 2^111010212121 is an apocalyptic number.

It is an amenable number.

111010212121 is a deficient number, since it is larger than the sum of its proper divisors (5774349479).

111010212121 is an equidigital number, since it uses as much as digits as its factorization.

111010212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64880399.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111010212121 its reverse (121212010111), we get a palindrome (232222222232).

The spelling of 111010212121 in words is "one hundred eleven billion, ten million, two hundred twelve thousand, one hundred twenty-one".