233628421 has 4 divisors (see below), whose sum is σ = 251599852. Its totient is φ = 215656992.

The previous prime is 233628419. The next prime is 233628449. The reversal of 233628421 is 124826332.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9796900 + 223831521 = 3130^2 + 14961^2 .

It is a cyclic number.

It is not a de Polignac number, because 233628421 - 2¹ = 233628419 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 (233628221) 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, 8985696 + ... + 8985721.

It is an arithmetic number, because the mean of its divisors is an integer number (62899963).

Almost surely, 2^233628421 is an apocalyptic number.

It is an amenable number.

233628421 is a deficient number, since it is larger than the sum of its proper divisors (17971431).

233628421 is a wasteful number, since it uses less digits than its factorization.

233628421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17971430.

The product of its digits is 13824, while the sum is 31.

The square root of 233628421 is about 15284.9082758125. The cubic root of 233628421 is about 615.8976654721.

The spelling of 233628421 in words is "two hundred thirty-three million, six hundred twenty-eight thousand, four hundred twenty-one".