20221211221221 has 16 divisors (see below), whose sum is σ = 28547749080000. Its totient is φ = 12687749131008.

The previous prime is 20221211221213. The next prime is 20221211221241. The reversal of 20221211221221 is 12212211212202.

It is not a de Polignac number, because 20221211221221 - 2³ = 20221211221213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221211221201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9241155 + ... + 11217903.

It is an arithmetic number, because the mean of its divisors is an integer number (1784234317500).

Almost surely, 2^{20221211221221} is an apocalyptic number.

It is an amenable number.

20221211221221 is a deficient number, since it is larger than the sum of its proper divisors (8326537858779).

20221211221221 is a wasteful number, since it uses less digits than its factorization.

20221211221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177348.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 20221211221221 its reverse (12212211212202), we get a palindrome (32433422433423).

The spelling of 20221211221221 in words is "twenty trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".