31012021123 has 2 divisors, whose sum is σ = 31012021124. Its totient is φ = 31012021122.

The previous prime is 31012021067. The next prime is 31012021127. The reversal of 31012021123 is 32112021013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31012021123 - 2²⁵ = 30978466691 is a prime.

It is a super-2 number, since 2×31012021123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31012021097 and 31012021106.

It is not a weakly prime, because it can be changed into another prime (31012021127) 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, 15506010561 + 15506010562.

It is an arithmetic number, because the mean of its divisors is an integer number (15506010562).

Almost surely, 2^31012021123 is an apocalyptic number.

31012021123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012021123 is an equidigital number, since it uses as much as digits as its factorization.

31012021123 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 16.

Adding to 31012021123 its reverse (32112021013), we get a palindrome (63124042136).

The spelling of 31012021123 in words is "thirty-one billion, twelve million, twenty-one thousand, one hundred twenty-three".