111212021021231 has 8 divisors (see below), whose sum is σ = 122687933134704. Its totient is φ = 100153414802880.

The previous prime is 111212021021219. The next prime is 111212021021237. The reversal of 111212021021231 is 132120120212111.

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-111212021021231 is a prime.

It is a super-2 number, since 2×111212021021231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212021021237) 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, 104326473221 + ... + 104326474286.

It is an arithmetic number, because the mean of its divisors is an integer number (15335991641838).

Almost surely, 2^{111212021021231} is an apocalyptic number.

111212021021231 is a deficient number, since it is larger than the sum of its proper divisors (11475912113473).

111212021021231 is a wasteful number, since it uses less digits than its factorization.

111212021021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208652947561.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 111212021021231 its reverse (132120120212111), we get a palindrome (243332141233342).

The spelling of 111212021021231 in words is "one hundred eleven trillion, two hundred twelve billion, twenty-one million, twenty-one thousand, two hundred thirty-one".