20221221030221 has 4 divisors (see below), whose sum is σ = 21410704620252. Its totient is φ = 19031737440192.

The previous prime is 20221221030167. The next prime is 20221221030271. The reversal of 20221221030221 is 12203012212202.

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 10232871640996 + 9988349389225 = 3198886^2 + 3160435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221221030221 - 2²⁶ = 20221153921357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20221221030193 and 20221221030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221221030271) 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, 594741794990 + ... + 594741795023.

It is an arithmetic number, because the mean of its divisors is an integer number (5352676155063).

Almost surely, 2^{20221221030221} is an apocalyptic number.

It is an amenable number.

20221221030221 is a deficient number, since it is larger than the sum of its proper divisors (1189483590031).

20221221030221 is a wasteful number, since it uses less digits than its factorization.

20221221030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189483590030.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20221221030221 its reverse (12203012212202), we get a palindrome (32424233242423).

The spelling of 20221221030221 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, thirty thousand, two hundred twenty-one".