20121031311 has 8 divisors (see below), whose sum is σ = 27282754560. Its totient is φ = 13186664472.

The previous prime is 20121031291. The next prime is 20121031379. The reversal of 20121031311 is 11313012102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121031311 - 2⁵ = 20121031279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121031211) 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 7 ways as a sum of consecutive naturals, for example, 56838895 + ... + 56839248.

It is an arithmetic number, because the mean of its divisors is an integer number (3410344320).

Almost surely, 2^20121031311 is an apocalyptic number.

20121031311 is a deficient number, since it is larger than the sum of its proper divisors (7161723249).

20121031311 is a wasteful number, since it uses less digits than its factorization.

20121031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113678205.

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

Adding to 20121031311 its reverse (11313012102), we get a palindrome (31434043413).

The spelling of 20121031311 in words is "twenty billion, one hundred twenty-one million, thirty-one thousand, three hundred eleven".