21321313001 has 4 divisors (see below), whose sum is σ = 21432943104. Its totient is φ = 21209682900.

The previous prime is 21321312989. The next prime is 21321313061. The reversal of 21321313001 is 10031312312.

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-21321313001 is a prime.

It is a super-2 number, since 2×21321313001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321313061) 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, 55814765 + ... + 55815146.

It is an arithmetic number, because the mean of its divisors is an integer number (5358235776).

Almost surely, 2^21321313001 is an apocalyptic number.

It is an amenable number.

21321313001 is a deficient number, since it is larger than the sum of its proper divisors (111630103).

21321313001 is a wasteful number, since it uses less digits than its factorization.

21321313001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111630102.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21321313001 its reverse (10031312312), we get a palindrome (31352625313).

The spelling of 21321313001 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, one".