221000100442 has 16 divisors (see below), whose sum is σ = 361672107264. Its totient is φ = 100444708000.

The previous prime is 221000100439. The next prime is 221000100613. The reversal of 221000100442 is 244001000122.

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, 263059 + ... + 714982.

It is an arithmetic number, because the mean of its divisors is an integer number (22604506704).

Almost surely, 2^221000100442 is an apocalyptic number.

221000100442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221000100442 is a deficient number, since it is larger than the sum of its proper divisors (140672006822).

221000100442 is a wasteful number, since it uses less digits than its factorization.

221000100442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988325.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221000100442 its reverse (244001000122), we get a palindrome (465001100564).

The spelling of 221000100442 in words is "two hundred twenty-one billion, one hundred thousand, four hundred forty-two".