233220021 has 8 divisors (see below), whose sum is σ = 311051520. Its totient is φ = 155434272.

The previous prime is 233219999. The next prime is 233220049. The reversal of 233220021 is 120022332.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 233220021 - 2¹⁷ = 233088949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233220821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3100 + ... + 21818.

It is an arithmetic number, because the mean of its divisors is an integer number (38881440).

Almost surely, 2^233220021 is an apocalyptic number.

It is an amenable number.

233220021 is a deficient number, since it is larger than the sum of its proper divisors (77831499).

233220021 is a wasteful number, since it uses less digits than its factorization.

233220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22875.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 233220021 is about 15271.5428493653. The cubic root of 233220021 is about 615.5385777179.

Adding to 233220021 its reverse (120022332), we get a palindrome (353242353).

The spelling of 233220021 in words is "two hundred thirty-three million, two hundred twenty thousand, twenty-one".