111311310021 has 16 divisors (see below), whose sum is σ = 149295073536. Its totient is φ = 73767670976.

The previous prime is 111311310017. The next prime is 111311310037. The reversal of 111311310021 is 120013113111.

It is a cyclic number.

It is not a de Polignac number, because 111311310021 - 2² = 111311310017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111311310001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5045611 + ... + 5067623.

It is an arithmetic number, because the mean of its divisors is an integer number (9330942096).

Almost surely, 2^111311310021 is an apocalyptic number.

It is an amenable number.

111311310021 is a deficient number, since it is larger than the sum of its proper divisors (37983763515).

111311310021 is a wasteful number, since it uses less digits than its factorization.

111311310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31932.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 111311310021 its reverse (120013113111), we get a palindrome (231324423132).

The spelling of 111311310021 in words is "one hundred eleven billion, three hundred eleven million, three hundred ten thousand, twenty-one".