21343443406 has 16 divisors (see below), whose sum is σ = 32233677840. Its totient is φ = 10599031360.

The previous prime is 21343443383. The next prime is 21343443427. The reversal of 21343443406 is 60434434312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257610 + ... + 330226.

It is an arithmetic number, because the mean of its divisors is an integer number (2014604865).

Almost surely, 2^21343443406 is an apocalyptic number.

21343443406 is a deficient number, since it is larger than the sum of its proper divisors (10890234434).

21343443406 is a wasteful number, since it uses less digits than its factorization.

21343443406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73619.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21343443406 its reverse (60434434312), we get a palindrome (81777877718).

The spelling of 21343443406 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-three thousand, four hundred six".