820112211031 has 2 divisors, whose sum is σ = 820112211032. Its totient is φ = 820112211030.

The previous prime is 820112211007. The next prime is 820112211101. The reversal of 820112211031 is 130112211028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820112211031 - 2⁵ = 820112210999 is a prime.

It is a super-2 number, since 2×820112211031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 820112210993 and 820112211011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820112211631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410056105515 + 410056105516.

It is an arithmetic number, because the mean of its divisors is an integer number (410056105516).

Almost surely, 2^820112211031 is an apocalyptic number.

820112211031 is a deficient number, since it is larger than the sum of its proper divisors (1).

820112211031 is an equidigital number, since it uses as much as digits as its factorization.

820112211031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 820112211031 its reverse (130112211028), we get a palindrome (950224422059).

The spelling of 820112211031 in words is "eight hundred twenty billion, one hundred twelve million, two hundred eleven thousand, thirty-one".