20211201121221 has 12 divisors (see below), whose sum is σ = 31847953282080. Its totient is φ = 12249212800680.

The previous prime is 20211201121211. The next prime is 20211201121273. The reversal of 20211201121221 is 12212110211202.

20211201121221 is a `hidden beast` number, since 20 + 211 + 201 + 1 + 212 + 21 = 666.

It is not a de Polignac number, because 20211201121221 - 2⁶ = 20211201121157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211201121194 and 20211201121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211201121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102076773241 + ... + 102076773438.

It is an arithmetic number, because the mean of its divisors is an integer number (2653996106840).

Almost surely, 2^{20211201121221} is an apocalyptic number.

It is an amenable number.

20211201121221 is a deficient number, since it is larger than the sum of its proper divisors (11636752160859).

20211201121221 is a wasteful number, since it uses less digits than its factorization.

20211201121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204153546696 (or 204153546693 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20211201121221 its reverse (12212110211202), we get a palindrome (32423311332423).

The spelling of 20211201121221 in words is "twenty trillion, two hundred eleven billion, two hundred one million, one hundred twenty-one thousand, two hundred twenty-one".