12821531620039 has 4 divisors (see below), whose sum is σ = 12821538892624. Its totient is φ = 12821524347456.

The previous prime is 12821531620021. The next prime is 12821531620043. The reversal of 12821531620039 is 93002613512821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12821531620039 - 2⁴¹ = 10622508364487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12821531619977 and 12821531620004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821531620049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868174 + ... + 5137780.

It is an arithmetic number, because the mean of its divisors is an integer number (3205384723156).

Almost surely, 2^{12821531620039} is an apocalyptic number.

12821531620039 is a deficient number, since it is larger than the sum of its proper divisors (7272585).

12821531620039 is an equidigital number, since it uses as much as digits as its factorization.

12821531620039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7272584.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 12821531620039 in words is "twelve trillion, eight hundred twenty-one billion, five hundred thirty-one million, six hundred twenty thousand, thirty-nine".