321205221053 has 4 divisors (see below), whose sum is σ = 321217117788. Its totient is φ = 321193324320.

The previous prime is 321205221049. The next prime is 321205221079. The reversal of 321205221053 is 350122502123.

It is a happy number.

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 54290398009 + 266914823044 = 233003^2 + 516638^2 .

It is a cyclic number.

It is not a de Polignac number, because 321205221053 - 2² = 321205221049 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 (321205221853) 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, 5907776 + ... + 5961897.

It is an arithmetic number, because the mean of its divisors is an integer number (80304279447).

Almost surely, 2^321205221053 is an apocalyptic number.

It is an amenable number.

321205221053 is a deficient number, since it is larger than the sum of its proper divisors (11896735).

321205221053 is a wasteful number, since it uses less digits than its factorization.

321205221053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11896734.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 321205221053 its reverse (350122502123), we get a palindrome (671327723176).

The spelling of 321205221053 in words is "three hundred twenty-one billion, two hundred five million, two hundred twenty-one thousand, fifty-three".