21222012012111 has 16 divisors (see below), whose sum is σ = 32524156341600. Its totient is φ = 13660145662464.

The previous prime is 21222012012079. The next prime is 21222012012221. The reversal of 21222012012111 is 11121021022212.

21222012012111 is a `hidden beast` number, since 212 + 220 + 1 + 20 + 1 + 211 + 1 = 666.

It is not a de Polignac number, because 21222012012111 - 2⁵ = 21222012012079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222012022111) 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, 13551731026 + ... + 13551732591.

It is an arithmetic number, because the mean of its divisors is an integer number (2032759771350).

Almost surely, 2^{21222012012111} is an apocalyptic number.

21222012012111 is a deficient number, since it is larger than the sum of its proper divisors (11302144329489).

21222012012111 is a wasteful number, since it uses less digits than its factorization.

21222012012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27103463655 (or 27103463649 counting only the distinct ones).

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

Adding to 21222012012111 its reverse (11121021022212), we get a palindrome (32343033034323).

The spelling of 21222012012111 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, twelve thousand, one hundred eleven".