821222222129 has 8 divisors (see below), whose sum is σ = 871823691360. Its totient is φ = 770875672896.

The previous prime is 821222222011. The next prime is 821222222147. The reversal of 821222222129 is 921222222128.

821222222129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821222222129 - 2¹⁶ = 821222156593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821222228129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63723359 + ... + 63736244.

It is an arithmetic number, because the mean of its divisors is an integer number (108977961420).

Almost surely, 2^821222222129 is an apocalyptic number.

It is an amenable number.

821222222129 is a deficient number, since it is larger than the sum of its proper divisors (50601469231).

821222222129 is a wasteful number, since it uses less digits than its factorization.

821222222129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127459999.

The product of its digits is 18432, while the sum is 35.

Subtracting 821222222129 from its reverse (921222222128), we obtain a palindrome (99999999999).

The spelling of 821222222129 in words is "eight hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-nine".