21201222102111 has 12 divisors (see below), whose sum is σ = 30624194853720. Its totient is φ = 14134052357520.

The previous prime is 21201222102091. The next prime is 21201222102197. The reversal of 21201222102111 is 11120122210212.

21201222102111 is a `hidden beast` number, since 2 + 120 + 122 + 210 + 211 + 1 = 666.

It is not a de Polignac number, because 21201222102111 - 2³³ = 21192632167519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201222102811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6559725 + ... + 9242966.

It is an arithmetic number, because the mean of its divisors is an integer number (2552016237810).

Almost surely, 2^{21201222102111} is an apocalyptic number.

21201222102111 is a deficient number, since it is larger than the sum of its proper divisors (9422972751609).

21201222102111 is a wasteful number, since it uses less digits than its factorization.

21201222102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15951766 (or 15951763 counting only the distinct ones).

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

Adding to 21201222102111 its reverse (11120122210212), we get a palindrome (32321344312323).

It can be divided in two parts, 2120122210211 and 1, that added together give a palindrome (2120122210212).

The spelling of 21201222102111 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred two thousand, one hundred eleven".