21120110001111 has 16 divisors (see below), whose sum is σ = 31024320006528. Its totient is φ = 12673333332000.

The previous prime is 21120110001101. The next prime is 21120110001121. The reversal of 21120110001111 is 11110001102112.

It is an interprime number because it is at equal distance from previous prime (21120110001101) and next prime (21120110001121).

It is not a de Polignac number, because 21120110001111 - 2⁵ = 21120110001079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110001101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3168330001 + ... + 3168336666.

It is an arithmetic number, because the mean of its divisors is an integer number (1939020000408).

Almost surely, 2^{21120110001111} is an apocalyptic number.

21120110001111 is a deficient number, since it is larger than the sum of its proper divisors (9904210005417).

21120110001111 is a wasteful number, since it uses less digits than its factorization.

21120110001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336666782.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21120110001111 its reverse (11110001102112), we get a palindrome (32230111103223).

The spelling of 21120110001111 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, one thousand, one hundred eleven".