234140021 has 16 divisors (see below), whose sum is σ = 251769600. Its totient is φ = 217080000.

The previous prime is 234140003. The next prime is 234140029. The reversal of 234140021 is 120041432.

It is a cyclic number.

It is not a de Polignac number, because 234140021 - 2²² = 229945717 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 (234140029) 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 15 ways as a sum of consecutive naturals, for example, 311396 + ... + 312146.

It is an arithmetic number, because the mean of its divisors is an integer number (15735600).

Almost surely, 2^234140021 is an apocalyptic number.

It is an amenable number.

234140021 is a deficient number, since it is larger than the sum of its proper divisors (17629579).

234140021 is a wasteful number, since it uses less digits than its factorization.

234140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 234140021 is about 15301.6345858866. The cubic root of 234140021 is about 616.3469023792.

Adding to 234140021 its reverse (120041432), we get a palindrome (354181453).

The spelling of 234140021 in words is "two hundred thirty-four million, one hundred forty thousand, twenty-one".