220413821 has 2 divisors, whose sum is σ = 220413822. Its totient is φ = 220413820.

The previous prime is 220413799. The next prime is 220413859. The reversal of 220413821 is 128314022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 26925721 = 13910^2 + 5189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220413821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220413881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110206910 + 110206911.

It is an arithmetic number, because the mean of its divisors is an integer number (110206911).

Almost surely, 2^220413821 is an apocalyptic number.

It is an amenable number.

220413821 is a deficient number, since it is larger than the sum of its proper divisors (1).

220413821 is an equidigital number, since it uses as much as digits as its factorization.

220413821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 220413821 is about 14846.3403234602. The cubic root of 220413821 is about 604.0593455496.

Adding to 220413821 its reverse (128314022), we get a palindrome (348727843).

The spelling of 220413821 in words is "two hundred twenty million, four hundred thirteen thousand, eight hundred twenty-one".