31120011421 has 2 divisors, whose sum is σ = 31120011422. Its totient is φ = 31120011420.

The previous prime is 31120011343. The next prime is 31120011449. The reversal of 31120011421 is 12411002113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28456316100 + 2663695321 = 168690^2 + 51611^2 .

It is an emirp because it is prime and its reverse (12411002113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120011421 is a prime.

It is a super-2 number, since 2×31120011421² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31120011395 and 31120011404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120012421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560005710 + 15560005711.

It is an arithmetic number, because the mean of its divisors is an integer number (15560005711).

Almost surely, 2^31120011421 is an apocalyptic number.

It is an amenable number.

31120011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120011421 is an equidigital number, since it uses as much as digits as its factorization.

31120011421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31120011421 its reverse (12411002113), we get a palindrome (43531013534).

The spelling of 31120011421 in words is "thirty-one billion, one hundred twenty million, eleven thousand, four hundred twenty-one".