221335021 has 8 divisors (see below), whose sum is σ = 225993600. Its totient is φ = 216724032.

The previous prime is 221335013. The next prime is 221335039. The reversal of 221335021 is 120533122.

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 221335021 - 2³ = 221335013 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 221335021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221335421) 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, 2421 + ... + 21178.

It is an arithmetic number, because the mean of its divisors is an integer number (28249200).

Almost surely, 2^221335021 is an apocalyptic number.

It is an amenable number.

221335021 is a deficient number, since it is larger than the sum of its proper divisors (4658579).

221335021 is a wasteful number, since it uses less digits than its factorization.

221335021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23795.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 221335021 is about 14877.3324557866. The cubic root of 221335021 is about 604.8997133591.

Adding to 221335021 its reverse (120533122), we get a palindrome (341868143).

The spelling of 221335021 in words is "two hundred twenty-one million, three hundred thirty-five thousand, twenty-one".