221001233 has 4 divisors (see below), whose sum is σ = 221881968. Its totient is φ = 220120500.

The previous prime is 221001223. The next prime is 221001247. The reversal of 221001233 is 332100122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221001233 - 2¹⁴ = 220984849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001223) 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, 439991 + ... + 440492.

It is an arithmetic number, because the mean of its divisors is an integer number (55470492).

Almost surely, 2^221001233 is an apocalyptic number.

It is an amenable number.

221001233 is a deficient number, since it is larger than the sum of its proper divisors (880735).

221001233 is an equidigital number, since it uses as much as digits as its factorization.

221001233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880734.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221001233 is about 14866.1102175384. The cubic root of 221001233 is about 604.5954839805.

Adding to 221001233 its reverse (332100122), we get a palindrome (553101355).

The spelling of 221001233 in words is "two hundred twenty-one million, one thousand, two hundred thirty-three".