31230231421 has 2 divisors, whose sum is σ = 31230231422. Its totient is φ = 31230231420.

The previous prime is 31230231371. The next prime is 31230231443. The reversal of 31230231421 is 12413203213.

It is an a-pointer prime, because the next prime (31230231443) can be obtained adding 31230231421 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16731422500 + 14498808921 = 129350^2 + 120411^2 .

It is an emirp because it is prime and its reverse (12413203213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31230231421 - 2³³ = 22640296829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31230231392 and 31230231401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31230232421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615115710 + 15615115711.

It is an arithmetic number, because the mean of its divisors is an integer number (15615115711).

Almost surely, 2^31230231421 is an apocalyptic number.

It is an amenable number.

31230231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230231421 is an equidigital number, since it uses as much as digits as its factorization.

31230231421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31230231421 its reverse (12413203213), we get a palindrome (43643434634).

The spelling of 31230231421 in words is "thirty-one billion, two hundred thirty million, two hundred thirty-one thousand, four hundred twenty-one".