21113304343 has 16 divisors (see below), whose sum is σ = 22697902080. Its totient is φ = 19568105856.

The previous prime is 21113304341. The next prime is 21113304347. The reversal of 21113304343 is 34340331112.

It is a cyclic number.

It is not a de Polignac number, because 21113304343 - 2¹ = 21113304341 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 (21113304341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493846 + ... + 534892.

It is an arithmetic number, because the mean of its divisors is an integer number (1418618880).

Almost surely, 2^21113304343 is an apocalyptic number.

21113304343 is a deficient number, since it is larger than the sum of its proper divisors (1584597737).

21113304343 is a wasteful number, since it uses less digits than its factorization.

21113304343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41526.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21113304343 its reverse (34340331112), we get a palindrome (55453635455).

The spelling of 21113304343 in words is "twenty-one billion, one hundred thirteen million, three hundred four thousand, three hundred forty-three".