2005421231 has 8 divisors (see below), whose sum is σ = 2188262784. Its totient is φ = 1822668120.

The previous prime is 2005421219. The next prime is 2005421237. The reversal of 2005421231 is 1321245002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005421231 is a prime.

It is a super-2 number, since 2×2005421231² = 8043428627491110722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005421237) 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, 30830 + ... + 70436.

It is an arithmetic number, because the mean of its divisors is an integer number (273532848).

Almost surely, 2^2005421231 is an apocalyptic number.

2005421231 is a deficient number, since it is larger than the sum of its proper divisors (182841553).

2005421231 is a wasteful number, since it uses less digits than its factorization.

2005421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44221.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2005421231 is about 44781.9297373394. The cubic root of 2005421231 is about 1261.0584100399.

Adding to 2005421231 its reverse (1321245002), we get a palindrome (3326666233).

The spelling of 2005421231 in words is "two billion, five million, four hundred twenty-one thousand, two hundred thirty-one".