220404522221 has 8 divisors (see below), whose sum is σ = 239091263544. Its totient is φ = 201965287680.

The previous prime is 220404522179. The next prime is 220404522251. The reversal of 220404522221 is 122225404022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62685136900 + 157719385321 = 250370^2 + 397139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220404522221 - 2¹⁸ = 220404260077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220404522251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61874840 + ... + 61878401.

It is an arithmetic number, because the mean of its divisors is an integer number (29886407943).

Almost surely, 2^220404522221 is an apocalyptic number.

It is an amenable number.

220404522221 is a deficient number, since it is larger than the sum of its proper divisors (18686741323).

220404522221 is a wasteful number, since it uses less digits than its factorization.

220404522221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123753391.

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 220404522221 its reverse (122225404022), we get a palindrome (342629926243).

The spelling of 220404522221 in words is "two hundred twenty billion, four hundred four million, five hundred twenty-two thousand, two hundred twenty-one".