111212211021 has 8 divisors (see below), whose sum is σ = 152290595424. Its totient is φ = 72137650320.

The previous prime is 111212211007. The next prime is 111212211133. The reversal of 111212211021 is 120112212111.

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 111212211021 - 2⁶ = 111212210957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212212021) 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, 500955795 + ... + 500956016.

It is an arithmetic number, because the mean of its divisors is an integer number (19036324428).

Almost surely, 2^111212211021 is an apocalyptic number.

It is an amenable number.

111212211021 is a deficient number, since it is larger than the sum of its proper divisors (41078384403).

111212211021 is a wasteful number, since it uses less digits than its factorization.

111212211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001911851.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111212211021 its reverse (120112212111), we get a palindrome (231324423132).

The spelling of 111212211021 in words is "one hundred eleven billion, two hundred twelve million, two hundred eleven thousand, twenty-one".