231221203002 has 36 divisors (see below), whose sum is σ = 508134899610. Its totient is φ = 75988158960.

The previous prime is 231221203001. The next prime is 231221203033. The reversal of 231221203002 is 200302122132.

It can be written as a sum of positive squares in only one way, i.e., 230293452321 + 927750681 = 479889^2 + 30459^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231221203001) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1183377 + ... + 1364852.

Almost surely, 2^231221203002 is an apocalyptic number.

231221203002 is an abundant number, since it is smaller than the sum of its proper divisors (276913696608).

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

231221203002 is a wasteful number, since it uses less digits than its factorization.

231221203002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548379 (or 2548305 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 231221203002 its reverse (200302122132), we get a palindrome (431523325134).

The spelling of 231221203002 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred three thousand, two".