220011212221 has 4 divisors (see below), whose sum is σ = 232953048252. Its totient is φ = 207069376192.

The previous prime is 220011212159. The next prime is 220011212231. The reversal of 220011212221 is 122212110022.

It is a happy number.

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 184458224196 + 35552988025 = 429486^2 + 188555^2 .

It is a cyclic number.

It is not a de Polignac number, because 220011212221 - 2²¹ = 220009115069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220011212195 and 220011212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220011212231) 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, 6470917990 + ... + 6470918023.

It is an arithmetic number, because the mean of its divisors is an integer number (58238262063).

Almost surely, 2^220011212221 is an apocalyptic number.

It is an amenable number.

220011212221 is a deficient number, since it is larger than the sum of its proper divisors (12941836031).

220011212221 is a wasteful number, since it uses less digits than its factorization.

220011212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12941836030.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220011212221 its reverse (122212110022), we get a palindrome (342223322243).

The spelling of 220011212221 in words is "two hundred twenty billion, eleven million, two hundred twelve thousand, two hundred twenty-one".