231221403304 has 8 divisors (see below), whose sum is σ = 433540131210. Its totient is φ = 115610701648.

The previous prime is 231221403277. The next prime is 231221403341. The reversal of 231221403304 is 403304122132.

It can be written as a sum of positive squares in only one way, i.e., 163460107204 + 67761296100 = 404302^2 + 260310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14451337699 + ... + 14451337714.

Almost surely, 2^231221403304 is an apocalyptic number.

It is an amenable number.

231221403304 is a deficient number, since it is larger than the sum of its proper divisors (202318727906).

231221403304 is a wasteful number, since it uses less digits than its factorization.

231221403304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28902675419 (or 28902675415 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 231221403304 its reverse (403304122132), we get a palindrome (634525525436).

The spelling of 231221403304 in words is "two hundred thirty-one billion, two hundred twenty-one million, four hundred three thousand, three hundred four".