220012221221 has 8 divisors (see below), whose sum is σ = 237919379544. Its totient is φ = 202245511680.

The previous prime is 220012221157. The next prime is 220012221257. The reversal of 220012221221 is 122122210022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6924736225 + 213087484996 = 83215^2 + 461614^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220012221221 - 2⁶ = 220012221157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220012221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220012221281) 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, 35108936 + ... + 35115201.

It is an arithmetic number, because the mean of its divisors is an integer number (29739922443).

Almost surely, 2^220012221221 is an apocalyptic number.

It is an amenable number.

220012221221 is a deficient number, since it is larger than the sum of its proper divisors (17907158323).

220012221221 is a wasteful number, since it uses less digits than its factorization.

220012221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70224391.

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

Adding to 220012221221 its reverse (122122210022), we get a palindrome (342134431243).

The spelling of 220012221221 in words is "two hundred twenty billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".