21404636043 has 12 divisors (see below), whose sum is σ = 33199027560. Its totient is φ = 12231220512.

The previous prime is 21404636041. The next prime is 21404636059. The reversal of 21404636043 is 34063640412.

It is not a de Polignac number, because 21404636043 - 2¹ = 21404636041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21404635995 and 21404636013.

It is not an unprimeable number, because it can be changed into a prime (21404636041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72804738 + ... + 72805031.

It is an arithmetic number, because the mean of its divisors is an integer number (2766585630).

Almost surely, 2^21404636043 is an apocalyptic number.

21404636043 is a deficient number, since it is larger than the sum of its proper divisors (11794391517).

21404636043 is a wasteful number, since it uses less digits than its factorization.

21404636043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145609786 (or 145609779 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The spelling of 21404636043 in words is "twenty-one billion, four hundred four million, six hundred thirty-six thousand, forty-three".