821534425412 has 48 divisors (see below), whose sum is σ = 1537889649408. Its totient is φ = 382636531200.

The previous prime is 821534425363. The next prime is 821534425441. The reversal of 821534425412 is 214524435128.

It is a self number, because there is not a number n which added to its sum of digits gives 821534425412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20082203 + ... + 20123069.

It is an arithmetic number, because the mean of its divisors is an integer number (32039367696).

Almost surely, 2^821534425412 is an apocalyptic number.

It is an amenable number.

821534425412 is a deficient number, since it is larger than the sum of its proper divisors (716355223996).

821534425412 is a wasteful number, since it uses less digits than its factorization.

821534425412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43916 (or 43914 counting only the distinct ones).

The product of its digits is 307200, while the sum is 41.

The spelling of 821534425412 in words is "eight hundred twenty-one billion, five hundred thirty-four million, four hundred twenty-five thousand, four hundred twelve".