31121033011 has 2 divisors, whose sum is σ = 31121033012. Its totient is φ = 31121033010.

The previous prime is 31121033003. The next prime is 31121033057. The reversal of 31121033011 is 11033012113.

It is a weak prime.

It is an emirp because it is prime and its reverse (11033012113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31121033011 - 2³ = 31121033003 is a prime.

It is a super-2 number, since 2×31121033011² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31121033311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560516505 + 15560516506.

It is an arithmetic number, because the mean of its divisors is an integer number (15560516506).

Almost surely, 2^31121033011 is an apocalyptic number.

31121033011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121033011 is an equidigital number, since it uses as much as digits as its factorization.

31121033011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31121033011 its reverse (11033012113), we get a palindrome (42154045124).

The spelling of 31121033011 in words is "thirty-one billion, one hundred twenty-one million, thirty-three thousand, eleven".