21343442006 has 16 divisors (see below), whose sum is σ = 32248736304. Its totient is φ = 10594014624.

The previous prime is 21343441993. The next prime is 21343442023. The reversal of 21343442006 is 60024434312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343442006.

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, 248576 + ... + 323228.

It is an arithmetic number, because the mean of its divisors is an integer number (2015546019).

Almost surely, 2^21343442006 is an apocalyptic number.

21343442006 is a deficient number, since it is larger than the sum of its proper divisors (10905294298).

21343442006 is a wasteful number, since it uses less digits than its factorization.

21343442006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75695.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21343442006 its reverse (60024434312), we get a palindrome (81367876318).

The spelling of 21343442006 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, six".