12005621357 has 4 divisors (see below), whose sum is σ = 12711834396. Its totient is φ = 11299408320.

The previous prime is 12005621339. The next prime is 12005621359. The reversal of 12005621357 is 75312650021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8334594436 + 3671026921 = 91294^2 + 60589^2 .

It is a cyclic number.

It is not a de Polignac number, because 12005621357 - 2¹⁸ = 12005359213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005621359) 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, 353106494 + ... + 353106527.

It is an arithmetic number, because the mean of its divisors is an integer number (3177958599).

Almost surely, 2^12005621357 is an apocalyptic number.

12005621357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12005621357 is a deficient number, since it is larger than the sum of its proper divisors (706213039).

12005621357 is an equidigital number, since it uses as much as digits as its factorization.

12005621357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706213038.

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 12005621357 in words is "twelve billion, five million, six hundred twenty-one thousand, three hundred fifty-seven".