821838130071 has 16 divisors (see below), whose sum is σ = 1253394256128. Its totient is φ = 469220731200.

The previous prime is 821838130031. The next prime is 821838130109. The reversal of 821838130071 is 170031838128.

It is not a de Polignac number, because 821838130071 - 2⁷ = 821838129943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821838130031) 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, 16685550 + ... + 16734731.

It is an arithmetic number, because the mean of its divisors is an integer number (78337141008).

Almost surely, 2^821838130071 is an apocalyptic number.

821838130071 is a deficient number, since it is larger than the sum of its proper divisors (431556126057).

821838130071 is a wasteful number, since it uses less digits than its factorization.

821838130071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33421462.

The product of its (nonzero) digits is 64512, while the sum is 42.

Adding to 821838130071 its reverse (170031838128), we get a palindrome (991869968199).

The spelling of 821838130071 in words is "eight hundred twenty-one billion, eight hundred thirty-eight million, one hundred thirty thousand, seventy-one".