233545221 has 96 divisors (see below), whose sum is σ = 446369280. Its totient is φ = 119532672.

The previous prime is 233545219. The next prime is 233545231. The reversal of 233545221 is 122545332.

It is a happy number.

It is not a de Polignac number, because 233545221 - 2¹ = 233545219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233545231) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 636180 + ... + 636546.

It is an arithmetic number, because the mean of its divisors is an integer number (4649680).

Almost surely, 2^233545221 is an apocalyptic number.

233545221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

233545221 is a deficient number, since it is larger than the sum of its proper divisors (212824059).

233545221 is a wasteful number, since it uses less digits than its factorization.

233545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 427 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 233545221 is about 15282.1863946230. The cubic root of 233545221 is about 615.8245454159.

The spelling of 233545221 in words is "two hundred thirty-three million, five hundred forty-five thousand, two hundred twenty-one".