306688431221 has 8 divisors (see below), whose sum is σ = 309737539488. Its totient is φ = 303639570000.

The previous prime is 306688431193. The next prime is 306688431227. The reversal of 306688431221 is 122134886603.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 306688431221 - 2¹⁰ = 306688430197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306688431227) 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 7 ways as a sum of consecutive naturals, for example, 3382286 + ... + 3471776.

It is an arithmetic number, because the mean of its divisors is an integer number (38717192436).

Almost surely, 2^306688431221 is an apocalyptic number.

It is an amenable number.

306688431221 is a deficient number, since it is larger than the sum of its proper divisors (3049108267).

306688431221 is a wasteful number, since it uses less digits than its factorization.

306688431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123523.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 306688431221 in words is "three hundred six billion, six hundred eighty-eight million, four hundred thirty-one thousand, two hundred twenty-one".