305142021 has 12 divisors (see below), whose sum is σ = 454979200. Its totient is φ = 196865640.

The previous prime is 305142007. The next prime is 305142029. The reversal of 305142021 is 120241503.

It is not a de Polignac number, because 305142021 - 2¹¹ = 305139973 is a prime.

It is a super-2 number, since 2×305142021² = 186223305959928882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 305141985 and 305142003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305142029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546571 + ... + 547128.

Almost surely, 2^305142021 is an apocalyptic number.

305142021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

305142021 is a deficient number, since it is larger than the sum of its proper divisors (149837179).

305142021 is a wasteful number, since it uses less digits than its factorization.

305142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093736 (or 1093733 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 305142021 is about 17468.3147727536. The cubic root of 305142021 is about 673.2360130941.

Adding to 305142021 its reverse (120241503), we get a palindrome (425383524).

The spelling of 305142021 in words is "three hundred five million, one hundred forty-two thousand, twenty-one".