210123211031 has 2 divisors, whose sum is σ = 210123211032. Its totient is φ = 210123211030.

The previous prime is 210123211027. The next prime is 210123211061. The reversal of 210123211031 is 130112321012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210123211031 - 2² = 210123211027 is a prime.

It is a super-2 number, since 2×210123211031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210123211061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061605515 + 105061605516.

It is an arithmetic number, because the mean of its divisors is an integer number (105061605516).

Almost surely, 2^210123211031 is an apocalyptic number.

210123211031 is a deficient number, since it is larger than the sum of its proper divisors (1).

210123211031 is an equidigital number, since it uses as much as digits as its factorization.

210123211031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 210123211031 its reverse (130112321012), we get a palindrome (340235532043).

The spelling of 210123211031 in words is "two hundred ten billion, one hundred twenty-three million, two hundred eleven thousand, thirty-one".