221400041 has 4 divisors (see below), whose sum is σ = 226800084. Its totient is φ = 216000000.

The previous prime is 221400031. The next prime is 221400043. The reversal of 221400041 is 140004122.

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 92236816 + 129163225 = 9604^2 + 11365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221400041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221399989 and 221400025.

It is not an unprimeable number, because it can be changed into a prime (221400043) 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, 2699960 + ... + 2700041.

It is an arithmetic number, because the mean of its divisors is an integer number (56700021).

Almost surely, 2^221400041 is an apocalyptic number.

It is an amenable number.

221400041 is a deficient number, since it is larger than the sum of its proper divisors (5400043).

221400041 is an equidigital number, since it uses as much as digits as its factorization.

221400041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400042.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221400041 is about 14879.5174988976. The cubic root of 221400041 is about 604.9589399086.

Adding to 221400041 its reverse (140004122), we get a palindrome (361404163).

The spelling of 221400041 in words is "two hundred twenty-one million, four hundred thousand, forty-one".