21094400005 has 16 divisors (see below), whose sum is σ = 28932925824. Its totient is φ = 14463000000.

The previous prime is 21094399999. The next prime is 21094400017. The reversal of 21094400005 is 50000449012.

It is a de Polignac number, because none of the positive numbers 2^k-21094400005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306255 + ... + 368755.

It is an arithmetic number, because the mean of its divisors is an integer number (1808307864).

Almost surely, 2^21094400005 is an apocalyptic number.

It is an amenable number.

21094400005 is a deficient number, since it is larger than the sum of its proper divisors (7838525819).

21094400005 is an equidigital number, since it uses as much as digits as its factorization.

21094400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72156.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21094400005 its reverse (50000449012), we get a palindrome (71094849017).

The spelling of 21094400005 in words is "twenty-one billion, ninety-four million, four hundred thousand, five".