21120222012111 has 56 divisors (see below), whose sum is σ = 32772477024000. Its totient is φ = 13588523468352.

The previous prime is 21120222012107. The next prime is 21120222012119. The reversal of 21120222012111 is 11121022202112.

21120222012111 is a `hidden beast` number, since 211 + 20 + 2 + 220 + 1 + 211 + 1 = 666.

It is not a de Polignac number, because 21120222012111 - 2² = 21120222012107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222012119) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 47111605 + ... + 47557793.

It is an arithmetic number, because the mean of its divisors is an integer number (585222804000).

Almost surely, 2^{21120222012111} is an apocalyptic number.

21120222012111 is a deficient number, since it is larger than the sum of its proper divisors (11652255011889).

21120222012111 is an equidigital number, since it uses as much as digits as its factorization.

21120222012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448475 (or 448460 counting only the distinct ones).

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

Adding to 21120222012111 its reverse (11121022202112), we get a palindrome (32241244214223).

The spelling of 21120222012111 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, twelve thousand, one hundred eleven".