321221002131 has 32 divisors (see below), whose sum is σ = 480922989120. Its totient is φ = 211880558592.

The previous prime is 321221002117. The next prime is 321221002133. The reversal of 321221002131 is 131200122123.

321221002131 is a `hidden beast` number, since 321 + 2 + 210 + 0 + 2 + 131 = 666.

It is not a de Polignac number, because 321221002131 - 2¹⁰ = 321221001107 is a prime.

It is a super-2 number, since 2×321221002131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321221002133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10652131 + ... + 10682243.

It is an arithmetic number, because the mean of its divisors is an integer number (15028843410).

Almost surely, 2^321221002131 is an apocalyptic number.

321221002131 is a deficient number, since it is larger than the sum of its proper divisors (159701986989).

321221002131 is a wasteful number, since it uses less digits than its factorization.

321221002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34292 (or 34286 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 321221002131 its reverse (131200122123), we get a palindrome (452421124254).

The spelling of 321221002131 in words is "three hundred twenty-one billion, two hundred twenty-one million, two thousand, one hundred thirty-one".