21075637443 has 32 divisors (see below), whose sum is σ = 34013468160. Its totient is φ = 11331770880.

The previous prime is 21075637441. The next prime is 21075637483. The reversal of 21075637443 is 34473657012.

It is not a de Polignac number, because 21075637443 - 2¹ = 21075637441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21075637395 and 21075637404.

It is not an unprimeable number, because it can be changed into a prime (21075637441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2183953 + ... + 2193581.

It is an arithmetic number, because the mean of its divisors is an integer number (1062920880).

Almost surely, 2^21075637443 is an apocalyptic number.

21075637443 is a deficient number, since it is larger than the sum of its proper divisors (12937830717).

21075637443 is a wasteful number, since it uses less digits than its factorization.

21075637443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15787.

The product of its (nonzero) digits is 423360, while the sum is 42.

The spelling of 21075637443 in words is "twenty-one billion, seventy-five million, six hundred thirty-seven thousand, four hundred forty-three".