20131213111 has 2 divisors, whose sum is σ = 20131213112. Its totient is φ = 20131213110.

The previous prime is 20131213033. The next prime is 20131213129. The reversal of 20131213111 is 11131213102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20131213111 - 2²¹ = 20129115959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20131213181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065606555 + 10065606556.

It is an arithmetic number, because the mean of its divisors is an integer number (10065606556).

Almost surely, 2^20131213111 is an apocalyptic number.

20131213111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131213111 is an equidigital number, since it uses as much as digits as its factorization.

20131213111 is an evil number, because the sum of its binary digits is even.

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

Adding to 20131213111 its reverse (11131213102), we get a palindrome (31262426213).

Subtracting from 20131213111 its reverse (11131213102), we obtain a palindrome (9000000009).

The spelling of 20131213111 in words is "twenty billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred eleven".