31203120321011 has 2 divisors, whose sum is σ = 31203120321012. Its totient is φ = 31203120321010.

The previous prime is 31203120321007. The next prime is 31203120321017. The reversal of 31203120321011 is 11012302130213.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (11012302130213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31203120321011 - 2² = 31203120321007 is a prime.

It is a super-2 number, since 2×31203120321011² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31203120321017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601560160505 + 15601560160506.

It is an arithmetic number, because the mean of its divisors is an integer number (15601560160506).

Almost surely, 2^{31203120321011} is an apocalyptic number.

31203120321011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203120321011 is an equidigital number, since it uses as much as digits as its factorization.

31203120321011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31203120321011 its reverse (11012302130213), we get a palindrome (42215422451224).

The spelling of 31203120321011 in words is "thirty-one trillion, two hundred three billion, one hundred twenty million, three hundred twenty-one thousand, eleven".