31212420013 has 2 divisors, whose sum is σ = 31212420014. Its totient is φ = 31212420012.

The previous prime is 31212419963. The next prime is 31212420047. The reversal of 31212420013 is 31002421213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22137571369 + 9074848644 = 148787^2 + 95262^2 .

It is an emirp because it is prime and its reverse (31002421213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31212420013 - 2¹³ = 31212411821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212424013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606210006 + 15606210007.

It is an arithmetic number, because the mean of its divisors is an integer number (15606210007).

Almost surely, 2^31212420013 is an apocalyptic number.

It is an amenable number.

31212420013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212420013 is an equidigital number, since it uses as much as digits as its factorization.

31212420013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31212420013 its reverse (31002421213), we get a palindrome (62214841226).

The spelling of 31212420013 in words is "thirty-one billion, two hundred twelve million, four hundred twenty thousand, thirteen".