221221200041 has 4 divisors (see below), whose sum is σ = 221428143300. Its totient is φ = 221014256784.

The previous prime is 221221200037. The next prime is 221221200089. The reversal of 221221200041 is 140002122122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84614083225 + 136607116816 = 290885^2 + 369604^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221200041 - 2² = 221221200037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221221199992 and 221221200019.

It is not an unprimeable number, because it can be changed into a prime (221221200001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103470026 + ... + 103472163.

It is an arithmetic number, because the mean of its divisors is an integer number (55357035825).

Almost surely, 2^221221200041 is an apocalyptic number.

It is an amenable number.

221221200041 is a deficient number, since it is larger than the sum of its proper divisors (206943259).

221221200041 is a wasteful number, since it uses less digits than its factorization.

221221200041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206943258.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221221200041 its reverse (140002122122), we get a palindrome (361223322163).

The spelling of 221221200041 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, forty-one".