307143221 has 12 divisors (see below), whose sum is σ = 389770560. Its totient is φ = 239331960.

The previous prime is 307143197. The next prime is 307143241. The reversal of 307143221 is 122341703.

It is not a de Polignac number, because 307143221 - 2¹⁴ = 307126837 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 (307143241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284381 + ... + 285458.

It is an arithmetic number, because the mean of its divisors is an integer number (32480880).

Almost surely, 2^307143221 is an apocalyptic number.

It is an amenable number.

307143221 is a deficient number, since it is larger than the sum of its proper divisors (82627339).

307143221 is a wasteful number, since it uses less digits than its factorization.

307143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569864 (or 569857 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 307143221 is about 17525.5020184872. The cubic root of 307143221 is about 674.7045591389.

Adding to 307143221 its reverse (122341703), we get a palindrome (429484924).

The spelling of 307143221 in words is "three hundred seven million, one hundred forty-three thousand, two hundred twenty-one".