221016642 has 32 divisors (see below), whose sum is σ = 551107584. Its totient is φ = 57406800.

The previous prime is 221016629. The next prime is 221016667. The reversal of 221016642 is 246610122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238734 + ... + 239657.

It is an arithmetic number, because the mean of its divisors is an integer number (17222112).

Almost surely, 2^221016642 is an apocalyptic number.

221016642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221016642 is an abundant number, since it is smaller than the sum of its proper divisors (330090942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221016642 is a wasteful number, since it uses less digits than its factorization.

221016642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478414.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 221016642 is about 14866.6284678134. The cubic root of 221016642 is about 604.6095351771.

Adding to 221016642 its reverse (246610122), we get a palindrome (467626764).

The spelling of 221016642 in words is "two hundred twenty-one million, sixteen thousand, six hundred forty-two".