21331343343 has 16 divisors (see below), whose sum is σ = 29318423040. Its totient is φ = 13788235776.

The previous prime is 21331343329. The next prime is 21331343393. The reversal of 21331343343 is 34334313312.

It is not a de Polignac number, because 21331343343 - 2⁹ = 21331342831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21331343343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331343393) 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, 691858 + ... + 722031.

It is an arithmetic number, because the mean of its divisors is an integer number (1832401440).

Almost surely, 2^21331343343 is an apocalyptic number.

21331343343 is a deficient number, since it is larger than the sum of its proper divisors (7987079697).

21331343343 is a wasteful number, since it uses less digits than its factorization.

21331343343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414046.

The product of its digits is 23328, while the sum is 30.

Adding to 21331343343 its reverse (34334313312), we get a palindrome (55665656655).

The spelling of 21331343343 in words is "twenty-one billion, three hundred thirty-one million, three hundred forty-three thousand, three hundred forty-three".