21415043343 has 8 divisors (see below), whose sum is σ = 29794843008. Its totient is φ = 13655969624.

The previous prime is 21415043333. The next prime is 21415043357. The reversal of 21415043343 is 34334051412.

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 21415043343 - 2⁵ = 21415043311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21415043343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415043323) 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, 155181405 + ... + 155181542.

It is an arithmetic number, because the mean of its divisors is an integer number (3724355376).

Almost surely, 2^21415043343 is an apocalyptic number.

21415043343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21415043343 is a deficient number, since it is larger than the sum of its proper divisors (8379799665).

21415043343 is a wasteful number, since it uses less digits than its factorization.

21415043343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310362973.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21415043343 its reverse (34334051412), we get a palindrome (55749094755).

The spelling of 21415043343 in words is "twenty-one billion, four hundred fifteen million, forty-three thousand, three hundred forty-three".