234181021 has 2 divisors, whose sum is σ = 234181022. Its totient is φ = 234181020.

The previous prime is 234181019. The next prime is 234181027. The reversal of 234181021 is 120181432.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138415225 + 95765796 = 11765^2 + 9786^2 .

It is a cyclic number.

It is not a de Polignac number, because 234181021 - 2¹ = 234181019 is a prime.

Together with 234181019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 234180983 and 234181001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (234181027) 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 as a sum of consecutive naturals, namely, 117090510 + 117090511.

It is an arithmetic number, because the mean of its divisors is an integer number (117090511).

Almost surely, 2^234181021 is an apocalyptic number.

It is an amenable number.

234181021 is a deficient number, since it is larger than the sum of its proper divisors (1).

234181021 is an equidigital number, since it uses as much as digits as its factorization.

234181021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 234181021 is about 15302.9742533927. The cubic root of 234181021 is about 616.3828762209.

The spelling of 234181021 in words is "two hundred thirty-four million, one hundred eighty-one thousand, twenty-one".