21140142343 has 4 divisors (see below), whose sum is σ = 21429733408. Its totient is φ = 20850551280.

The previous prime is 21140142341. The next prime is 21140142377. The reversal of 21140142343 is 34324104112.

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 21140142343 - 2¹ = 21140142341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140142341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144795423 + ... + 144795568.

It is an arithmetic number, because the mean of its divisors is an integer number (5357433352).

Almost surely, 2^21140142343 is an apocalyptic number.

21140142343 is a deficient number, since it is larger than the sum of its proper divisors (289591065).

21140142343 is an equidigital number, since it uses as much as digits as its factorization.

21140142343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289591064.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21140142343 its reverse (34324104112), we get a palindrome (55464246455).

The spelling of 21140142343 in words is "twenty-one billion, one hundred forty million, one hundred forty-two thousand, three hundred forty-three".