20111231343 has 16 divisors (see below), whose sum is σ = 30851366400. Its totient is φ = 11415002016.

The previous prime is 20111231339. The next prime is 20111231351. The reversal of 20111231343 is 34313211102.

It is not a de Polignac number, because 20111231343 - 2² = 20111231339 is a prime.

It is a super-2 number, since 2×20111231343² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111231363) 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, 3210555 + ... + 3216812.

It is an arithmetic number, because the mean of its divisors is an integer number (1928210400).

Almost surely, 2^20111231343 is an apocalyptic number.

20111231343 is a deficient number, since it is larger than the sum of its proper divisors (10740135057).

20111231343 is a wasteful number, since it uses less digits than its factorization.

20111231343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427526.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20111231343 its reverse (34313211102), we get a palindrome (54424442445).

The spelling of 20111231343 in words is "twenty billion, one hundred eleven million, two hundred thirty-one thousand, three hundred forty-three".