21140566443 has 12 divisors (see below), whose sum is σ = 31036970848. Its totient is φ = 13862666160.

The previous prime is 21140566441. The next prime is 21140566451. The reversal of 21140566443 is 34466504112.

21140566443 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 0 + 5 + 6 + 644 + 3 = 666.

It is not a de Polignac number, because 21140566443 - 2¹ = 21140566441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140566398 and 21140566407.

It is not an unprimeable number, because it can be changed into a prime (21140566441) 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, 19253155 + ... + 19254252.

Almost surely, 2^21140566443 is an apocalyptic number.

21140566443 is a deficient number, since it is larger than the sum of its proper divisors (9896404405).

21140566443 is a wasteful number, since it uses less digits than its factorization.

21140566443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38507474 (or 38507471 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21140566443 in words is "twenty-one billion, one hundred forty million, five hundred sixty-six thousand, four hundred forty-three".