21320140343 has 8 divisors (see below), whose sum is σ = 21848307936. Its totient is φ = 20792361600.

The previous prime is 21320140319. The next prime is 21320140381. The reversal of 21320140343 is 34304102312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21320140343 - 2¹⁸ = 21319878199 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 (21320140313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15398 + ... + 207068.

It is an arithmetic number, because the mean of its divisors is an integer number (2731038492).

Almost surely, 2^21320140343 is an apocalyptic number.

21320140343 is a deficient number, since it is larger than the sum of its proper divisors (528167593).

21320140343 is a wasteful number, since it uses less digits than its factorization.

21320140343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194425.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21320140343 its reverse (34304102312), we get a palindrome (55624242655).

The spelling of 21320140343 in words is "twenty-one billion, three hundred twenty million, one hundred forty thousand, three hundred forty-three".