20211212220111 has 24 divisors (see below), whose sum is σ = 31853611455744. Its totient is φ = 12247050033360.

The previous prime is 20211212220053. The next prime is 20211212220113. The reversal of 20211212220111 is 11102221211202.

20211212220111 is a `hidden beast` number, since 20 + 211 + 212 + 220 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 20211212220111 - 2⁶ = 20211212220047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211212220113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17517241 + ... + 18635346.

It is an arithmetic number, because the mean of its divisors is an integer number (1327233810656).

Almost surely, 2^{20211212220111} is an apocalyptic number.

20211212220111 is a deficient number, since it is larger than the sum of its proper divisors (11642399235633).

20211212220111 is a wasteful number, since it uses less digits than its factorization.

20211212220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36158251 (or 36158248 counting only the distinct ones).

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

Adding to 20211212220111 its reverse (11102221211202), we get a palindrome (31313433431313).

The spelling of 20211212220111 in words is "twenty trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred eleven".