221335642 has 16 divisors (see below), whose sum is σ = 365775264. Its totient is φ = 99610000.

The previous prime is 221335637. The next prime is 221335657. The reversal of 221335642 is 246533122.

It is a self number, because there is not a number n which added to its sum of digits gives 221335642.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47584 + ... + 52027.

It is an arithmetic number, because the mean of its divisors is an integer number (22860954).

Almost surely, 2^221335642 is an apocalyptic number.

221335642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221335642 is a deficient number, since it is larger than the sum of its proper divisors (144439622).

221335642 is a wasteful number, since it uses less digits than its factorization.

221335642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99725.

The product of its digits is 8640, while the sum is 28.

The square root of 221335642 is about 14877.3533264489. The cubic root of 221335642 is about 604.9002790813.

Adding to 221335642 its reverse (246533122), we get a palindrome (467868764).

The spelling of 221335642 in words is "two hundred twenty-one million, three hundred thirty-five thousand, six hundred forty-two".