20131131211 has 8 divisors (see below), whose sum is σ = 20214223920. Its totient is φ = 20048100192.

The previous prime is 20131131203. The next prime is 20131131239. The reversal of 20131131211 is 11213113102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20131131211 - 2³ = 20131131203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131131311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707781 + ... + 735673.

It is an arithmetic number, because the mean of its divisors is an integer number (2526777990).

Almost surely, 2^20131131211 is an apocalyptic number.

20131131211 is a deficient number, since it is larger than the sum of its proper divisors (83092709).

20131131211 is a wasteful number, since it uses less digits than its factorization.

20131131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30845.

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

Adding to 20131131211 its reverse (11213113102), we get a palindrome (31344244313).

The spelling of 20131131211 in words is "twenty billion, one hundred thirty-one million, one hundred thirty-one thousand, two hundred eleven".