309114021 has 32 divisors (see below), whose sum is σ = 450211840. Its totient is φ = 187977024.

The previous prime is 309114017. The next prime is 309114031. The reversal of 309114021 is 120411903.

It is not a de Polignac number, because 309114021 - 2² = 309114017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309114031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216516 + ... + 217938.

It is an arithmetic number, because the mean of its divisors is an integer number (14069120).

Almost surely, 2^309114021 is an apocalyptic number.

It is an amenable number.

309114021 is a deficient number, since it is larger than the sum of its proper divisors (141097819).

309114021 is a wasteful number, since it uses less digits than its factorization.

309114021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 309114021 is about 17581.6387461465. The cubic root of 309114021 is about 676.1445755047.

Adding to 309114021 its reverse (120411903), we get a palindrome (429525924).

The spelling of 309114021 in words is "three hundred nine million, one hundred fourteen thousand, twenty-one".