233221021 has 8 divisors (see below), whose sum is σ = 255229344. Its totient is φ = 211347120.

The previous prime is 233220979. The next prime is 233221031. The reversal of 233221021 is 120122332.

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

It is a cyclic number.

It is not a de Polignac number, because 233221021 - 2⁷ = 233220893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 233220986 and 233221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233221031) 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, 29955 + ... + 36928.

It is an arithmetic number, because the mean of its divisors is an integer number (31903668).

Almost surely, 2^233221021 is an apocalyptic number.

It is an amenable number.

233221021 is a deficient number, since it is larger than the sum of its proper divisors (22008323).

233221021 is a wasteful number, since it uses less digits than its factorization.

233221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67211.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 233221021 is about 15271.5755899645. The cubic root of 233221021 is about 615.5394574847.

Adding to 233221021 its reverse (120122332), we get a palindrome (353343353).

The spelling of 233221021 in words is "two hundred thirty-three million, two hundred twenty-one thousand, twenty-one".