821534425413 has 16 divisors (see below), whose sum is σ = 1181045228160. Its totient is φ = 504957052224.

The previous prime is 821534425363. The next prime is 821534425441. The reversal of 821534425413 is 314524435128.

It is a happy number.

It is not a de Polignac number, because 821534425413 - 2¹⁷ = 821534294341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821534425493) 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, 12520906 + ... + 12586347.

It is an arithmetic number, because the mean of its divisors is an integer number (73815326760).

Almost surely, 2^821534425413 is an apocalyptic number.

It is an amenable number.

821534425413 is a deficient number, since it is larger than the sum of its proper divisors (359510802747).

821534425413 is a wasteful number, since it uses less digits than its factorization.

821534425413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25108108.

The product of its digits is 460800, while the sum is 42.

The spelling of 821534425413 in words is "eight hundred twenty-one billion, five hundred thirty-four million, four hundred twenty-five thousand, four hundred thirteen".