21231013001 has 4 divisors (see below), whose sum is σ = 23161105104. Its totient is φ = 19300920900.

The previous prime is 21231012991. The next prime is 21231013033. The reversal of 21231013001 is 10031013212.

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-21231013001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21231013051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965046035 + ... + 965046056.

It is an arithmetic number, because the mean of its divisors is an integer number (5790276276).

Almost surely, 2^21231013001 is an apocalyptic number.

It is an amenable number.

21231013001 is a deficient number, since it is larger than the sum of its proper divisors (1930092103).

21231013001 is a wasteful number, since it uses less digits than its factorization.

21231013001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930092102.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21231013001 its reverse (10031013212), we get a palindrome (31262026213).

The spelling of 21231013001 in words is "twenty-one billion, two hundred thirty-one million, thirteen thousand, one".