20211111220221 has 16 divisors (see below), whose sum is σ = 29993396193600. Its totient is φ = 13451120006544.

The previous prime is 20211111220189. The next prime is 20211111220249. The reversal of 20211111220221 is 12202211111202.

20211111220221 is a `hidden beast` number, since 2 + 0 + 211 + 1 + 11 + 220 + 221 = 666.

It is not a de Polignac number, because 20211111220221 - 2⁵ = 20211111220189 is a prime.

It is a super-2 number, since 2×20211111220221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20211111220194 and 20211111220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211111222221) 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 15 ways as a sum of consecutive naturals, for example, 637598866 + ... + 637630563.

It is an arithmetic number, because the mean of its divisors is an integer number (1874587262100).

Almost surely, 2^{20211111220221} is an apocalyptic number.

It is an amenable number.

20211111220221 is a deficient number, since it is larger than the sum of its proper divisors (9782284973379).

20211111220221 is a wasteful number, since it uses less digits than its factorization.

20211111220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275230025 (or 1275230019 counting only the distinct ones).

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

Adding to 20211111220221 its reverse (12202211111202), we get a palindrome (32413322331423).

The spelling of 20211111220221 in words is "twenty trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".