21321041343 has 16 divisors (see below), whose sum is σ = 32726357760. Its totient is φ = 12094520256.

The previous prime is 21321041323. The next prime is 21321041389. The reversal of 21321041343 is 34314012312.

It is a happy number.

It is not a de Polignac number, because 21321041343 - 2⁸ = 21321041087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321041323) 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, 3702553 + ... + 3708306.

It is an arithmetic number, because the mean of its divisors is an integer number (2045397360).

Almost surely, 2^21321041343 is an apocalyptic number.

21321041343 is a deficient number, since it is larger than the sum of its proper divisors (11405316417).

21321041343 is a wasteful number, since it uses less digits than its factorization.

21321041343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7411006.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21321041343 its reverse (34314012312), we get a palindrome (55635053655).

The spelling of 21321041343 in words is "twenty-one billion, three hundred twenty-one million, forty-one thousand, three hundred forty-three".