220222221221 has 4 divisors (see below), whose sum is σ = 220354647552. Its totient is φ = 220089794892.

The previous prime is 220222221203. The next prime is 220222221257. The reversal of 220222221221 is 122122222022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220222221221 is a prime.

It is a super-2 number, since 2×220222221221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220222221193 and 220222221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220222221721) 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, 66210671 + ... + 66213996.

It is an arithmetic number, because the mean of its divisors is an integer number (55088661888).

Almost surely, 2^220222221221 is an apocalyptic number.

It is an amenable number.

220222221221 is a deficient number, since it is larger than the sum of its proper divisors (132426331).

220222221221 is a wasteful number, since it uses less digits than its factorization.

220222221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132426330.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 220222221221 its reverse (122122222022), we get a palindrome (342344443243).

The spelling of 220222221221 in words is "two hundred twenty billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".