231221808 has 60 divisors (see below), whose sum is σ = 667987008. Its totient is φ = 74586240.

The previous prime is 231221801. The next prime is 231221827. The reversal of 231221808 is 808122132.

It is not an unprimeable number, because it can be changed into a prime (231221801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21435 + ... + 30362.

Almost surely, 2^231221808 is an apocalyptic number.

It is an amenable number.

231221808 is an abundant number, since it is smaller than the sum of its proper divisors (436765200).

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

231221808 is a wasteful number, since it uses less digits than its factorization.

231221808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51842 (or 51833 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 231221808 is about 15205.9793502425. The cubic root of 231221808 is about 613.7755689991.

The spelling of 231221808 in words is "two hundred thirty-one million, two hundred twenty-one thousand, eight hundred eight".