20222121201221 has 4 divisors (see below), whose sum is σ = 20350924521132. Its totient is φ = 20093317881312.

The previous prime is 20222121201167. The next prime is 20222121201257. The reversal of 20222121201221 is 12210212122202.

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 11141776684900 + 9080344516321 = 3337930^2 + 3013361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20222121201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20222121201193 and 20222121201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222121201281) 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, 64401659720 + ... + 64401660033.

It is an arithmetic number, because the mean of its divisors is an integer number (5087731130283).

Almost surely, 2^{20222121201221} is an apocalyptic number.

It is an amenable number.

20222121201221 is a deficient number, since it is larger than the sum of its proper divisors (128803319911).

20222121201221 is a wasteful number, since it uses less digits than its factorization.

20222121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128803319910.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20222121201221 its reverse (12210212122202), we get a palindrome (32432333323423).

The spelling of 20222121201221 in words is "twenty trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".