31020123101111 has 2 divisors, whose sum is σ = 31020123101112. Its totient is φ = 31020123101110.

The previous prime is 31020123100987. The next prime is 31020123101113. The reversal of 31020123101111 is 11110132102013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020123101111 is a prime.

Together with 31020123101113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31020123101111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020123101113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510061550555 + 15510061550556.

It is an arithmetic number, because the mean of its divisors is an integer number (15510061550556).

Almost surely, 2^{31020123101111} is an apocalyptic number.

31020123101111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020123101111 is an equidigital number, since it uses as much as digits as its factorization.

31020123101111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 31020123101111 its reverse (11110132102013), we get a palindrome (42130255203124).

The spelling of 31020123101111 in words is "thirty-one trillion, twenty billion, one hundred twenty-three million, one hundred one thousand, one hundred eleven".