820112211029 has 4 divisors (see below), whose sum is σ = 820148013900. Its totient is φ = 820076408160.

The previous prime is 820112211007. The next prime is 820112211031. The reversal of 820112211029 is 920112211028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 571732576900 + 248379634129 = 756130^2 + 498377^2 .

It is a cyclic number.

It is not a de Polignac number, because 820112211029 - 2³² = 815817243733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820112210992 and 820112211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820112211329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17867054 + ... + 17912895.

It is an arithmetic number, because the mean of its divisors is an integer number (205037003475).

Almost surely, 2^820112211029 is an apocalyptic number.

It is an amenable number.

820112211029 is a deficient number, since it is larger than the sum of its proper divisors (35802871).

820112211029 is a wasteful number, since it uses less digits than its factorization.

820112211029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35802870.

The product of its (nonzero) digits is 1152, while the sum is 29.

Subtracting 820112211029 from its reverse (920112211028), we obtain a palindrome (99999999999).

The spelling of 820112211029 in words is "eight hundred twenty billion, one hundred twelve million, two hundred eleven thousand, twenty-nine".