213131240422321 has 4 divisors (see below), whose sum is σ = 229525951224052. Its totient is φ = 196736529620592.

The previous prime is 213131240422301. The next prime is 213131240422391. The reversal of 213131240422321 is 123224042131312.

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 145773748742400 + 67357491679921 = 12073680^2 + 8207161^2 .

It is not a de Polignac number, because 213131240422321 - 2³⁹ = 212581484608433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131240422301) 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, 8197355400846 + ... + 8197355400871.

It is an arithmetic number, because the mean of its divisors is an integer number (57381487806013).

Almost surely, 2^{213131240422321} is an apocalyptic number.

It is an amenable number.

213131240422321 is a deficient number, since it is larger than the sum of its proper divisors (16394710801731).

213131240422321 is a wasteful number, since it uses less digits than its factorization.

213131240422321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16394710801730.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 213131240422321 its reverse (123224042131312), we get a palindrome (336355282553633).

The spelling of 213131240422321 in words is "two hundred thirteen trillion, one hundred thirty-one billion, two hundred forty million, four hundred twenty-two thousand, three hundred twenty-one".