21113431222321 has 8 divisors (see below), whose sum is σ = 21164333710184. Its totient is φ = 21062538604800.

The previous prime is 21113431222309. The next prime is 21113431222343. The reversal of 21113431222321 is 12322213431112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6292170896400 + 14821260325921 = 2508420^2 + 3849839^2 .

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 21113431222321 - 2¹³ = 21113431214129 is a prime.

It is a super-2 number, since 2×21113431222321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113431222321.

It is not an unprimeable number, because it can be changed into a prime (21113431222021) 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, 1824715 + ... + 6749551.

It is an arithmetic number, because the mean of its divisors is an integer number (2645541713773).

Almost surely, 2^{21113431222321} is an apocalyptic number.

It is an amenable number.

21113431222321 is a deficient number, since it is larger than the sum of its proper divisors (50902487863).

21113431222321 is an equidigital number, since it uses as much as digits as its factorization.

21113431222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4935171.

The product of its digits is 3456, while the sum is 28.

Adding to 21113431222321 its reverse (12322213431112), we get a palindrome (33435644653433).

The spelling of 21113431222321 in words is "twenty-one trillion, one hundred thirteen billion, four hundred thirty-one million, two hundred twenty-two thousand, three hundred twenty-one".