20121131013 has 16 divisors (see below), whose sum is σ = 27487876416. Its totient is φ = 13084364160.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131013 is 31013112102.

It is a happy number.

It is not a de Polignac number, because 20121131013 - 2⁶ = 20121130949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121130983 and 20121131001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121131053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777795 + ... + 803247.

It is an arithmetic number, because the mean of its divisors is an integer number (1717992276).

Almost surely, 2^20121131013 is an apocalyptic number.

It is an amenable number.

20121131013 is a deficient number, since it is larger than the sum of its proper divisors (7366745403).

20121131013 is a wasteful number, since it uses less digits than its factorization.

20121131013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31924.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20121131013 its reverse (31013112102), we get a palindrome (51134243115).

The spelling of 20121131013 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, thirteen".