221331442 has 4 divisors (see below), whose sum is σ = 331997166. Its totient is φ = 110665720.

The previous prime is 221331427. The next prime is 221331457. The reversal of 221331442 is 244133122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221331427) and next prime (221331457).

It can be written as a sum of positive squares in only one way, i.e., 138321121 + 83010321 = 11761^2 + 9111^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55332859 + ... + 55332862.

Almost surely, 2^221331442 is an apocalyptic number.

221331442 is a deficient number, since it is larger than the sum of its proper divisors (110665724).

221331442 is a wasteful number, since it uses less digits than its factorization.

221331442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110665723.

The product of its digits is 1152, while the sum is 22.

The square root of 221331442 is about 14877.2121716402. The cubic root of 221331442 is about 604.8964529205.

Adding to 221331442 its reverse (244133122), we get a palindrome (465464564).

The spelling of 221331442 in words is "two hundred twenty-one million, three hundred thirty-one thousand, four hundred forty-two".