321131220133 has 4 divisors (see below), whose sum is σ = 321257205900. Its totient is φ = 321005234368.

The previous prime is 321131220089. The next prime is 321131220217. The reversal of 321131220133 is 331022131123.

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 314387854209 + 6743365924 = 560703^2 + 82118^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131220133 - 2⁹ = 321131219621 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 (321131220433) 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, 62989060 + ... + 62994157.

It is an arithmetic number, because the mean of its divisors is an integer number (80314301475).

Almost surely, 2^321131220133 is an apocalyptic number.

It is an amenable number.

321131220133 is a deficient number, since it is larger than the sum of its proper divisors (125985767).

321131220133 is a wasteful number, since it uses less digits than its factorization.

321131220133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125985766.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 321131220133 its reverse (331022131123), we get a palindrome (652153351256).

The spelling of 321131220133 in words is "three hundred twenty-one billion, one hundred thirty-one million, two hundred twenty thousand, one hundred thirty-three".