31020120123111 has 32 divisors (see below), whose sum is σ = 52567358451200. Its totient is φ = 17710082377920.

The previous prime is 31020120123053. The next prime is 31020120123121. The reversal of 31020120123111 is 11132102102013.

31020120123111 is a `hidden beast` number, since 31 + 0 + 201 + 201 + 231 + 1 + 1 = 666.

It is not a de Polignac number, because 31020120123111 - 2¹⁰ = 31020120122087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020120123121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72473785 + ... + 72900546.

It is an arithmetic number, because the mean of its divisors is an integer number (1642729951600).

Almost surely, 2^{31020120123111} is an apocalyptic number.

31020120123111 is a deficient number, since it is larger than the sum of its proper divisors (21547238328089).

31020120123111 is a wasteful number, since it uses less digits than its factorization.

31020120123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145375476 (or 145375470 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31020120123111 its reverse (11132102102013), we get a palindrome (42152222225124).

The spelling of 31020120123111 in words is "thirty-one trillion, twenty billion, one hundred twenty million, one hundred twenty-three thousand, one hundred eleven".