111212021212021 has 4 divisors (see below), whose sum is σ = 111278895549952. Its totient is φ = 111145146874092.

The previous prime is 111212021212013. The next prime is 111212021212109. The reversal of 111212021212021 is 120212120212111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111212021212021 - 2³ = 111212021212013 is a prime.

It is a super-2 number, since 2×111212021212021² (a number of 29 digits) contains 22 as substring.

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 111212021212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212021212421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33437166471 + ... + 33437169796.

It is an arithmetic number, because the mean of its divisors is an integer number (27819723887488).

Almost surely, 2^{111212021212021} is an apocalyptic number.

It is an amenable number.

111212021212021 is a deficient number, since it is larger than the sum of its proper divisors (66874337931).

111212021212021 is an equidigital number, since it uses as much as digits as its factorization.

111212021212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66874337930.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111212021212021 its reverse (120212120212111), we get a palindrome (231424141424132).

The spelling of 111212021212021 in words is "one hundred eleven trillion, two hundred twelve billion, twenty-one million, two hundred twelve thousand, twenty-one".