234664021 has 4 divisors (see below), whose sum is σ = 234748192. Its totient is φ = 234579852.

The previous prime is 234664007. The next prime is 234664037. The reversal of 234664021 is 120466432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234664021 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 (234664061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37755 + ... + 43528.

It is an arithmetic number, because the mean of its divisors is an integer number (58687048).

Almost surely, 2^234664021 is an apocalyptic number.

It is an amenable number.

234664021 is a deficient number, since it is larger than the sum of its proper divisors (84171).

234664021 is an equidigital number, since it uses as much as digits as its factorization.

234664021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84170.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 234664021 is about 15318.7473704608. The cubic root of 234664021 is about 616.8063498850.

The spelling of 234664021 in words is "two hundred thirty-four million, six hundred sixty-four thousand, twenty-one".