111212101021 has 8 divisors (see below), whose sum is σ = 127738236800. Its totient is φ = 94845638448.

The previous prime is 111212101003. The next prime is 111212101031. The reversal of 111212101021 is 120101212111.

It is a happy number.

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 111212101021 - 2³¹ = 109064617373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212100992 and 111212101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212101031) 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, 39916806 + ... + 39919591.

It is an arithmetic number, because the mean of its divisors is an integer number (15967279600).

Almost surely, 2^111212101021 is an apocalyptic number.

It is an amenable number.

111212101021 is a deficient number, since it is larger than the sum of its proper divisors (16526135779).

111212101021 is an equidigital number, since it uses as much as digits as its factorization.

111212101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79836603.

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

Adding to 111212101021 its reverse (120101212111), we get a palindrome (231313313132).

The spelling of 111212101021 in words is "one hundred eleven billion, two hundred twelve million, one hundred one thousand, twenty-one".