20031122111 has 32 divisors (see below), whose sum is σ = 27335917056. Its totient is φ = 14171760000.

The previous prime is 20031122101. The next prime is 20031122129. The reversal of 20031122111 is 11122113002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031122111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031122101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102965 + ... + 225086.

It is an arithmetic number, because the mean of its divisors is an integer number (854247408).

Almost surely, 2^20031122111 is an apocalyptic number.

20031122111 is a deficient number, since it is larger than the sum of its proper divisors (7304794945).

20031122111 is a wasteful number, since it uses less digits than its factorization.

20031122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328143.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20031122111 its reverse (11122113002), we get a palindrome (31153235113).

The spelling of 20031122111 in words is "twenty billion, thirty-one million, one hundred twenty-two thousand, one hundred eleven".