21113342321 has 8 divisors (see below), whose sum is σ = 22358080584. Its totient is φ = 19868912640.

The previous prime is 21113342231. The next prime is 21113342339. The reversal of 21113342321 is 12324331112.

It can be written as a sum of positive squares in 4 ways, for example, as 4877485921 + 16235856400 = 69839^2 + 127420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113342321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113342521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71981 + ... + 217733.

It is an arithmetic number, because the mean of its divisors is an integer number (2794760073).

Almost surely, 2^21113342321 is an apocalyptic number.

It is an amenable number.

21113342321 is a deficient number, since it is larger than the sum of its proper divisors (1244738263).

21113342321 is a wasteful number, since it uses less digits than its factorization.

21113342321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154291.

The product of its digits is 864, while the sum is 23.

Adding to 21113342321 its reverse (12324331112), we get a palindrome (33437673433).

The spelling of 21113342321 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-two thousand, three hundred twenty-one".