821078870127 has 16 divisors (see below), whose sum is σ = 1100617785600. Its totient is φ = 544464657792.

The previous prime is 821078870119. The next prime is 821078870179. The reversal of 821078870127 is 721078870128.

It is not a de Polignac number, because 821078870127 - 2³ = 821078870119 is a prime.

It is a super-2 number, since 2×821078870127² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 821078870127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821078870627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1706788 + ... + 2134310.

It is an arithmetic number, because the mean of its divisors is an integer number (68788611600).

Almost surely, 2^821078870127 is an apocalyptic number.

821078870127 is a deficient number, since it is larger than the sum of its proper divisors (279538915473).

821078870127 is a wasteful number, since it uses less digits than its factorization.

821078870127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430942.

The product of its (nonzero) digits is 702464, while the sum is 51.

Subtracting from 821078870127 its reverse (721078870128), we obtain a palindrome (99999999999).

The spelling of 821078870127 in words is "eight hundred twenty-one billion, seventy-eight million, eight hundred seventy thousand, one hundred twenty-seven".