321221332002 has 16 divisors (see below), whose sum is σ = 642464262720. Its totient is φ = 107070177552.

The previous prime is 321221332001. The next prime is 321221332021. The reversal of 321221332002 is 200233122123.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 321221332002.

It is not an unprimeable number, because it can be changed into a prime (321221332001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703302 + ... + 1066337.

It is an arithmetic number, because the mean of its divisors is an integer number (40154016420).

Almost surely, 2^321221332002 is an apocalyptic number.

321221332002 is an abundant number, since it is smaller than the sum of its proper divisors (321242930718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321221332002 is a wasteful number, since it uses less digits than its factorization.

321221332002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799897.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 321221332002 its reverse (200233122123), we get a palindrome (521454454125).

The spelling of 321221332002 in words is "three hundred twenty-one billion, two hundred twenty-one million, three hundred thirty-two thousand, two".