321201153123421 has 4 divisors (see below), whose sum is σ = 321207692150844. Its totient is φ = 321194614096000.

The previous prime is 321201153123377. The next prime is 321201153123443. The reversal of 321201153123421 is 124321351102123.

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 172302245696025 + 148898907427396 = 13126395^2 + 12202414^2 .

It is a cyclic number.

It is not a de Polignac number, because 321201153123421 - 2⁷ = 321201153123293 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 (321201153121421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3269440030 + ... + 3269538271.

It is an arithmetic number, because the mean of its divisors is an integer number (80301923037711).

Almost surely, 2^{321201153123421} is an apocalyptic number.

It is an amenable number.

321201153123421 is a deficient number, since it is larger than the sum of its proper divisors (6539027423).

321201153123421 is an equidigital number, since it uses as much as digits as its factorization.

321201153123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539027422.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 321201153123421 in words is "three hundred twenty-one trillion, two hundred one billion, one hundred fifty-three million, one hundred twenty-three thousand, four hundred twenty-one".