221420233 has 4 divisors (see below), whose sum is σ = 223570048. Its totient is φ = 219270420.

The previous prime is 221420231. The next prime is 221420237. The reversal of 221420233 is 332024122.

221420233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 332024122 = 2 ⋅166012061.

It is a cyclic number.

It is not a de Polignac number, because 221420233 - 2¹ = 221420231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221420233.

It is not an unprimeable number, because it can be changed into a prime (221420231) 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, 1074753 + ... + 1074958.

It is an arithmetic number, because the mean of its divisors is an integer number (55892512).

Almost surely, 2^221420233 is an apocalyptic number.

It is an amenable number.

221420233 is a deficient number, since it is larger than the sum of its proper divisors (2149815).

221420233 is a wasteful number, since it uses less digits than its factorization.

221420233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149814.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221420233 is about 14880.1960000532. The cubic root of 221420233 is about 604.9773303893.

Adding to 221420233 its reverse (332024122), we get a palindrome (553444355).

The spelling of 221420233 in words is "two hundred twenty-one million, four hundred twenty thousand, two hundred thirty-three".