20111331121 has 12 divisors (see below), whose sum is σ = 23791339440. Its totient is φ = 16946107080.

The previous prime is 20111331113. The next prime is 20111331181. The reversal of 20111331121 is 12113311102.

It is a happy number.

It is not a de Polignac number, because 20111331121 - 2³ = 20111331113 is a prime.

It is a super-3 number, since 3×20111331121³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111331095 and 20111331104.

It is not an unprimeable number, because it can be changed into a prime (20111331101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3475375 + ... + 3481156.

It is an arithmetic number, because the mean of its divisors is an integer number (1982611620).

Almost surely, 2^20111331121 is an apocalyptic number.

It is an amenable number.

20111331121 is a deficient number, since it is larger than the sum of its proper divisors (3680008319).

20111331121 is an equidigital number, since it uses as much as digits as its factorization.

20111331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6956604 (or 6956597 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20111331121 its reverse (12113311102), we get a palindrome (32224642223).

The spelling of 20111331121 in words is "twenty billion, one hundred eleven million, three hundred thirty-one thousand, one hundred twenty-one".