821222222127 has 8 divisors (see below), whose sum is σ = 1094968927920. Its totient is φ = 547478498880.

The previous prime is 821222222011. The next prime is 821222222147. The reversal of 821222222127 is 721222222128.

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

It is not a de Polignac number, because 821222222127 - 2¹⁸ = 821221959983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821222222147) 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, 4699 + ... + 1281587.

It is an arithmetic number, because the mean of its divisors is an integer number (136871115990).

Almost surely, 2^821222222127 is an apocalyptic number.

821222222127 is a deficient number, since it is larger than the sum of its proper divisors (273746705793).

821222222127 is a wasteful number, since it uses less digits than its factorization.

821222222127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491273.

The product of its digits is 14336, while the sum is 33.

Subtracting from 821222222127 its reverse (721222222128), we obtain a palindrome (99999999999).

The spelling of 821222222127 in words is "eight hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-seven".