2131223012321 has 8 divisors (see below), whose sum is σ = 2351142835944. Its totient is φ = 1919300273280.

The previous prime is 2131223012311. The next prime is 2131223012339. The reversal of 2131223012321 is 1232103221312.

It can be written as a sum of positive squares in 4 ways, for example, as 194780995600 + 1936442016721 = 441340^2 + 1391561^2 .

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

It is not a de Polignac number, because 2131223012321 - 2⁶ = 2131223012257 is a prime.

It is a super-2 number, since 2×2131223012321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131223012311) 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, 1999270586 + ... + 1999271651.

It is an arithmetic number, because the mean of its divisors is an integer number (293892854493).

Almost surely, 2^{2131223012321} is an apocalyptic number.

It is an amenable number.

2131223012321 is a deficient number, since it is larger than the sum of its proper divisors (219919823623).

2131223012321 is a wasteful number, since it uses less digits than its factorization.

2131223012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998542291.

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

Adding to 2131223012321 its reverse (1232103221312), we get a palindrome (3363326233633).

The spelling of 2131223012321 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-three million, twelve thousand, three hundred twenty-one".