21124010005 has 40 divisors (see below), whose sum is σ = 29786954400. Its totient is φ = 14379690528.

The previous prime is 21124009999. The next prime is 21124010009. The reversal of 21124010005 is 50001042112.

It is not a de Polignac number, because 21124010005 - 2⁷ = 21124009877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124010009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1662366 + ... + 1675024.

It is an arithmetic number, because the mean of its divisors is an integer number (744673860).

Almost surely, 2^21124010005 is an apocalyptic number.

It is an amenable number.

21124010005 is a deficient number, since it is larger than the sum of its proper divisors (8662944395).

21124010005 is an equidigital number, since it uses as much as digits as its factorization.

21124010005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831 (or 12810 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21124010005 its reverse (50001042112), we get a palindrome (71125052117).

The spelling of 21124010005 in words is "twenty-one billion, one hundred twenty-four million, ten thousand, five".