21423143201311 has 4 divisors (see below), whose sum is σ = 21423161753392. Its totient is φ = 21423124649232.

The previous prime is 21423143201203. The next prime is 21423143201333. The reversal of 21423143201311 is 11310234132412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21423143201311 - 2¹⁹ = 21423142677023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21423143201311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423143201371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7420131 + ... + 9894676.

It is an arithmetic number, because the mean of its divisors is an integer number (5355790438348).

Almost surely, 2^{21423143201311} is an apocalyptic number.

21423143201311 is a deficient number, since it is larger than the sum of its proper divisors (18552081).

21423143201311 is a wasteful number, since it uses less digits than its factorization.

21423143201311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18552080.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21423143201311 its reverse (11310234132412), we get a palindrome (32733377333723).

The spelling of 21423143201311 in words is "twenty-one trillion, four hundred twenty-three billion, one hundred forty-three million, two hundred one thousand, three hundred eleven".