21112111122201 has 32 divisors (see below), whose sum is σ = 34127695872000. Its totient is φ = 12792551772240.

The previous prime is 21112111122173. The next prime is 21112111122239. The reversal of 21112111122201 is 10222111121112.

It is a happy number.

21112111122201 is a `hidden beast` number, since 211 + 121 + 1 + 112 + 220 + 1 = 666.

It is not a de Polignac number, because 21112111122201 - 2²⁹ = 21111574251289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112111122281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5980881 + ... + 8831486.

It is an arithmetic number, because the mean of its divisors is an integer number (1066490496000).

Almost surely, 2^{21112111122201} is an apocalyptic number.

It is an amenable number.

21112111122201 is a deficient number, since it is larger than the sum of its proper divisors (13015584749799).

21112111122201 is a wasteful number, since it uses less digits than its factorization.

21112111122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14817186 (or 14817180 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21112111122201 its reverse (10222111121112), we get a palindrome (31334222243313).

The spelling of 21112111122201 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred twenty-two thousand, two hundred one".