20121131001 has 16 divisors (see below), whose sum is σ = 26959274496. Its totient is φ = 13348586496.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131001 is 10013112102.

It is not a de Polignac number, because 20121131001 - 2¹ = 20121130999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121133001) 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 15 ways as a sum of consecutive naturals, for example, 2359321 + ... + 2367833.

It is an arithmetic number, because the mean of its divisors is an integer number (1684954656).

Almost surely, 2^20121131001 is an apocalyptic number.

It is an amenable number.

20121131001 is a deficient number, since it is larger than the sum of its proper divisors (6838143495).

20121131001 is a wasteful number, since it uses less digits than its factorization.

20121131001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 20121131001 its reverse (10013112102), we get a palindrome (30134243103).

The spelling of 20121131001 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand, one".