21132123005 has 16 divisors (see below), whose sum is σ = 28992017664. Its totient is φ = 14485188480.

The previous prime is 21132122989. The next prime is 21132123017. The reversal of 21132123005 is 50032123112.

It is not a de Polignac number, because 21132123005 - 2⁴ = 21132122989 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, 16472 + ... + 206241.

It is an arithmetic number, because the mean of its divisors is an integer number (1812001104).

Almost surely, 2^21132123005 is an apocalyptic number.

It is an amenable number.

21132123005 is a deficient number, since it is larger than the sum of its proper divisors (7859894659).

21132123005 is a wasteful number, since it uses less digits than its factorization.

21132123005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225436.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21132123005 its reverse (50032123112), we get a palindrome (71164246117).

The spelling of 21132123005 in words is "twenty-one billion, one hundred thirty-two million, one hundred twenty-three thousand, five".