21111110222201 has 32 divisors (see below), whose sum is σ = 22573365534720. Its totient is φ = 19701146836800.

The previous prime is 21111110222149. The next prime is 21111110222243. The reversal of 21111110222201 is 10222201111112.

It is not a de Polignac number, because 21111110222201 - 2²² = 21111106027897 is a prime.

It is a super-3 number, since 3×21111110222201³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111110222201.

It is not an unprimeable number, because it can be changed into a prime (21111110227201) 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, 86154266 + ... + 86398956.

It is an arithmetic number, because the mean of its divisors is an integer number (705417672960).

Almost surely, 2^{21111110222201} is an apocalyptic number.

It is an amenable number.

21111110222201 is a deficient number, since it is larger than the sum of its proper divisors (1462255312519).

21111110222201 is a wasteful number, since it uses less digits than its factorization.

21111110222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245357.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111110222201 its reverse (10222201111112), we get a palindrome (31333311333313).

The spelling of 21111110222201 in words is "twenty-one trillion, one hundred eleven billion, one hundred ten million, two hundred twenty-two thousand, two hundred one".