21120001001111 has 16 divisors (see below), whose sum is σ = 21473952729600. Its totient is φ = 20767837987008.

The previous prime is 21120001001059. The next prime is 21120001001129. The reversal of 21120001001111 is 11110010002112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120001001111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120001001092 and 21120001001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120001001191) 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, 73423010 + ... + 73710096.

It is an arithmetic number, because the mean of its divisors is an integer number (1342122045600).

Almost surely, 2^{21120001001111} is an apocalyptic number.

21120001001111 is a deficient number, since it is larger than the sum of its proper divisors (353951728489).

21120001001111 is a wasteful number, since it uses less digits than its factorization.

21120001001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290198.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21120001001111 its reverse (11110010002112), we get a palindrome (32230011003223).

The spelling of 21120001001111 in words is "twenty-one trillion, one hundred twenty billion, one million, one thousand, one hundred eleven".