21011341321 has 8 divisors (see below), whose sum is σ = 21072691080. Its totient is φ = 20950034688.

The previous prime is 21011341283. The next prime is 21011341327. The reversal of 21011341321 is 12314311012.

It can be written as a sum of positive squares in 4 ways, for example, as 2802537721 + 18208803600 = 52939^2 + 134940^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21011341321 - 2¹⁵ = 21011308553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011341327) 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, 1140975 + ... + 1159243.

It is an arithmetic number, because the mean of its divisors is an integer number (2634086385).

Almost surely, 2^21011341321 is an apocalyptic number.

It is an amenable number.

21011341321 is a deficient number, since it is larger than the sum of its proper divisors (61349759).

21011341321 is a wasteful number, since it uses less digits than its factorization.

21011341321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21563.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011341321 its reverse (12314311012), we get a palindrome (33325652333).

The spelling of 21011341321 in words is "twenty-one billion, eleven million, three hundred forty-one thousand, three hundred twenty-one".