21140443012 has 24 divisors (see below), whose sum is σ = 39897867800. Its totient is φ = 9743348736.

The previous prime is 21140442991. The next prime is 21140443021. The reversal of 21140443012 is 21034404112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1598080576 + 19542362436 = 39976^2 + 139794^2 .

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, 249837 + ... + 323572.

Almost surely, 2^21140443012 is an apocalyptic number.

It is an amenable number.

21140443012 is a deficient number, since it is larger than the sum of its proper divisors (18757424788).

21140443012 is a wasteful number, since it uses less digits than its factorization.

21140443012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574135 (or 574133 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21140443012 its reverse (21034404112), we get a palindrome (42174847124).

The spelling of 21140443012 in words is "twenty-one billion, one hundred forty million, four hundred forty-three thousand, twelve".