221432842 has 8 divisors (see below), whose sum is σ = 332212932. Its totient is φ = 110695200.

The previous prime is 221432819. The next prime is 221432857. The reversal of 221432842 is 248234122.

It can be written as a sum of positive squares in 2 ways, for example, as 142062561 + 79370281 = 11919^2 + 8909^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 221432842.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12492 + ... + 24472.

Almost surely, 2^221432842 is an apocalyptic number.

221432842 is a deficient number, since it is larger than the sum of its proper divisors (110780090).

221432842 is a wasteful number, since it uses less digits than its factorization.

221432842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21224.

The product of its digits is 6144, while the sum is 28.

The square root of 221432842 is about 14880.6196779570. The cubic root of 221432842 is about 604.9888138541.

Adding to 221432842 its reverse (248234122), we get a palindrome (469666964).

The spelling of 221432842 in words is "two hundred twenty-one million, four hundred thirty-two thousand, eight hundred forty-two".