20221211212201 has 4 divisors (see below), whose sum is σ = 20221544466900. Its totient is φ = 20220877957504.

The previous prime is 20221211212171. The next prime is 20221211212271. The reversal of 20221211212201 is 10221211212202.

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 6372095538601 + 13849115673600 = 2524301^2 + 3721440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221211212201 - 2²⁷ = 20221076994473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20221211212271) 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, 166536316 + ... + 166657693.

It is an arithmetic number, because the mean of its divisors is an integer number (5055386116725).

Almost surely, 2^{20221211212201} is an apocalyptic number.

It is an amenable number.

20221211212201 is a deficient number, since it is larger than the sum of its proper divisors (333254699).

20221211212201 is an equidigital number, since it uses as much as digits as its factorization.

20221211212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333254698.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20221211212201 its reverse (10221211212202), we get a palindrome (30442422424403).

Subtracting from 20221211212201 its reverse (10221211212202), we obtain a palindrome (9999999999999).

The spelling of 20221211212201 in words is "twenty trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred one".