20111331213 has 8 divisors (see below), whose sum is σ = 29794564800. Its totient is φ = 13407554124.

The previous prime is 20111331181. The next prime is 20111331319. The reversal of 20111331213 is 31213311102.

It is not a de Polignac number, because 20111331213 - 2⁵ = 20111331181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111331113) 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, 372432033 + ... + 372432086.

It is an arithmetic number, because the mean of its divisors is an integer number (3724320600).

Almost surely, 2^20111331213 is an apocalyptic number.

It is an amenable number.

20111331213 is a deficient number, since it is larger than the sum of its proper divisors (9683233587).

20111331213 is an equidigital number, since it uses as much as digits as its factorization.

20111331213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744864128 (or 744864122 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20111331213 its reverse (31213311102), we get a palindrome (51324642315).

The spelling of 20111331213 in words is "twenty billion, one hundred eleven million, three hundred thirty-one thousand, two hundred thirteen".