234240021 has 12 divisors (see below), whose sum is σ = 338655148. Its totient is φ = 156017664.

The previous prime is 234240001. The next prime is 234240023. The reversal of 234240021 is 120042432.

It can be written as a sum of positive squares in 2 ways, for example, as 89302500 + 144937521 = 9450^2 + 12039^2 .

It is not a de Polignac number, because 234240021 - 2⁷ = 234239893 is a prime.

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 = 234239976 and 234240003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234240023) 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, 910 + ... + 21663.

Almost surely, 2^234240021 is an apocalyptic number.

It is an amenable number.

234240021 is a deficient number, since it is larger than the sum of its proper divisors (104415127).

234240021 is a wasteful number, since it uses less digits than its factorization.

234240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23732 (or 23729 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 234240021 is about 15304.9018618219. The cubic root of 234240021 is about 616.4346360886.

Adding to 234240021 its reverse (120042432), we get a palindrome (354282453).

The spelling of 234240021 in words is "two hundred thirty-four million, two hundred forty thousand, twenty-one".