21213043343 has 8 divisors (see below), whose sum is σ = 22470731712. Its totient is φ = 19956450816.

The previous prime is 21213043303. The next prime is 21213043409. The reversal of 21213043343 is 34334031212.

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 21213043343 - 2⁸ = 21213043087 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 (21213043303) 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, 233930 + ... + 311687.

It is an arithmetic number, because the mean of its divisors is an integer number (2808841464).

Almost surely, 2^21213043343 is an apocalyptic number.

21213043343 is a deficient number, since it is larger than the sum of its proper divisors (1257688369).

21213043343 is a wasteful number, since it uses less digits than its factorization.

21213043343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547921.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21213043343 its reverse (34334031212), we get a palindrome (55547074555).

The spelling of 21213043343 in words is "twenty-one billion, two hundred thirteen million, forty-three thousand, three hundred forty-three".