20222220222221 has 4 divisors (see below), whose sum is σ = 21411762588252. Its totient is φ = 19032677856192.

The previous prime is 20222220222179. The next prime is 20222220222233. The reversal of 20222220222221 is 12222202222202.

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 9064549326121 + 11157670896100 = 3010739^2 + 3340310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222220222221 - 2⁶ = 20222220222157 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 (20222220222121) 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, 594771182990 + ... + 594771183023.

It is an arithmetic number, because the mean of its divisors is an integer number (5352940647063).

Almost surely, 2^{20222220222221} is an apocalyptic number.

It is an amenable number.

20222220222221 is a deficient number, since it is larger than the sum of its proper divisors (1189542366031).

20222220222221 is a wasteful number, since it uses less digits than its factorization.

20222220222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189542366030.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20222220222221 its reverse (12222202222202), we get a palindrome (32444422444423).

The spelling of 20222220222221 in words is "twenty trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".