21120001102111 has 4 divisors (see below), whose sum is σ = 21120339079224. Its totient is φ = 21119663125000.

The previous prime is 21120001102027. The next prime is 21120001102157. The reversal of 21120001102111 is 11120110002112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120001102111 - 2⁹ = 21120001101599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120001102091 and 21120001102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120001108111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168894805 + ... + 169019806.

It is an arithmetic number, because the mean of its divisors is an integer number (5280084769806).

Almost surely, 2^{21120001102111} is an apocalyptic number.

21120001102111 is a deficient number, since it is larger than the sum of its proper divisors (337977113).

21120001102111 is an equidigital number, since it uses as much as digits as its factorization.

21120001102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337977112.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21120001102111 its reverse (11120110002112), we get a palindrome (32240111104223).

The spelling of 21120001102111 in words is "twenty-one trillion, one hundred twenty billion, one million, one hundred two thousand, one hundred eleven".