234396821 has 6 divisors (see below), whose sum is σ = 242564790. Its totient is φ = 226234568.

The previous prime is 234396809. The next prime is 234396857. The reversal of 234396821 is 128693432.

It can be written as a sum of positive squares in only one way, i.e., 202066225 + 32330596 = 14215^2 + 5686^2 .

It is not a de Polignac number, because 234396821 - 2¹⁴ = 234380437 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 (234396121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81026 + ... + 83868.

It is an arithmetic number, because the mean of its divisors is an integer number (40427465).

Almost surely, 2^234396821 is an apocalyptic number.

It is an amenable number.

234396821 is a deficient number, since it is larger than the sum of its proper divisors (8167969).

234396821 is an frugal number, since it uses more digits than its factorization.

234396821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715 (or 2872 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 234396821 is about 15310.0235466834. The cubic root of 234396821 is about 616.5721522870.

The spelling of 234396821 in words is "two hundred thirty-four million, three hundred ninety-six thousand, eight hundred twenty-one".