21443511342206 has 16 divisors (see below), whose sum is σ = 32469894182016. Its totient is φ = 10620238079256.

The previous prime is 21443511342167. The next prime is 21443511342251. The reversal of 21443511342206 is 60224311534412.

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 21443511342206.

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, 4464716 + ... + 7925951.

It is an arithmetic number, because the mean of its divisors is an integer number (2029368386376).

Almost surely, 2^{21443511342206} is an apocalyptic number.

21443511342206 is a deficient number, since it is larger than the sum of its proper divisors (11026382839810).

21443511342206 is a wasteful number, since it uses less digits than its factorization.

21443511342206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12398863.

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21443511342206 its reverse (60224311534412), we get a palindrome (81667822876618).

The spelling of 21443511342206 in words is "twenty-one trillion, four hundred forty-three billion, five hundred eleven million, three hundred forty-two thousand, two hundred six".