20123231071 has 2 divisors, whose sum is σ = 20123231072. Its totient is φ = 20123231070.

The previous prime is 20123231069. The next prime is 20123231087. The reversal of 20123231071 is 17013232102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123231071 - 2¹ = 20123231069 is a prime.

Together with 20123231069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123201071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061615535 + 10061615536.

It is an arithmetic number, because the mean of its divisors is an integer number (10061615536).

Almost surely, 2^20123231071 is an apocalyptic number.

20123231071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123231071 is an equidigital number, since it uses as much as digits as its factorization.

20123231071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 20123231071 its reverse (17013232102), we get a palindrome (37136463173).

The spelling of 20123231071 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-one thousand, seventy-one".