5311231221421 has 2 divisors, whose sum is σ = 5311231221422. Its totient is φ = 5311231221420.

The previous prime is 5311231221419. The next prime is 5311231221503. The reversal of 5311231221421 is 1241221321135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4012565853321 + 1298665368100 = 2003139^2 + 1139590^2 .

It is a cyclic number.

It is not a de Polignac number, because 5311231221421 - 2¹ = 5311231221419 is a prime.

Together with 5311231221419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 5311231221421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5311234221421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655615610710 + 2655615610711.

It is an arithmetic number, because the mean of its divisors is an integer number (2655615610711).

Almost surely, 2^{5311231221421} is an apocalyptic number.

It is an amenable number.

5311231221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5311231221421 is an equidigital number, since it uses as much as digits as its factorization.

5311231221421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

Adding to 5311231221421 its reverse (1241221321135), we get a palindrome (6552452542556).

The spelling of 5311231221421 in words is "five trillion, three hundred eleven billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-one".