21231303222113 has 4 divisors (see below), whose sum is σ = 21303765008148. Its totient is φ = 21158841436080.

The previous prime is 21231303222109. The next prime is 21231303222133. The reversal of 21231303222113 is 31122230313212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19131421106704 + 2099882115409 = 4373948^2 + 1449097^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231303222113 - 2² = 21231303222109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231303222133) 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, 36230892578 + ... + 36230893163.

It is an arithmetic number, because the mean of its divisors is an integer number (5325941252037).

Almost surely, 2^{21231303222113} is an apocalyptic number.

It is an amenable number.

21231303222113 is a deficient number, since it is larger than the sum of its proper divisors (72461786035).

21231303222113 is an equidigital number, since it uses as much as digits as its factorization.

21231303222113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72461786034.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21231303222113 its reverse (31122230313212), we get a palindrome (52353533535325).

The spelling of 21231303222113 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred three million, two hundred twenty-two thousand, one hundred thirteen".