21124231440001 has 4 divisors (see below), whose sum is σ = 21124247461632. Its totient is φ = 21124215418372.

The previous prime is 21124231439963. The next prime is 21124231440017. The reversal of 21124231440001 is 10004413242112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124231440001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124231440031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5836345 + ... + 8735638.

It is an arithmetic number, because the mean of its divisors is an integer number (5281061865408).

Almost surely, 2^{21124231440001} is an apocalyptic number.

It is an amenable number.

21124231440001 is a deficient number, since it is larger than the sum of its proper divisors (16021631).

21124231440001 is a wasteful number, since it uses less digits than its factorization.

21124231440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16021630.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21124231440001 its reverse (10004413242112), we get a palindrome (31128644682113).

The spelling of 21124231440001 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred thirty-one million, four hundred forty thousand, one".