21113144343 has 20 divisors (see below), whose sum is σ = 31638920280. Its totient is φ = 14031010512.

The previous prime is 21113144341. The next prime is 21113144357. The reversal of 21113144343 is 34344131112.

21113144343 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 314 + 4 + 343 = 666.

It is not a de Polignac number, because 21113144343 - 2¹ = 21113144341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113144341) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 385453 + ... + 436806.

It is an arithmetic number, because the mean of its divisors is an integer number (1581946014).

Almost surely, 2^21113144343 is an apocalyptic number.

21113144343 is a deficient number, since it is larger than the sum of its proper divisors (10525775937).

21113144343 is an equidigital number, since it uses as much as digits as its factorization.

21113144343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822588 (or 822579 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 21113144343 its reverse (34344131112), we get a palindrome (55457275455).

The spelling of 21113144343 in words is "twenty-one billion, one hundred thirteen million, one hundred forty-four thousand, three hundred forty-three".