21120002111 has 8 divisors (see below), whose sum is σ = 22829173920. Its totient is φ = 19422909792.

The previous prime is 21120002089. The next prime is 21120002117. The reversal of 21120002111 is 11120002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21120002111 - 2¹⁸ = 21119739967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120002092 and 21120002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120002117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3016235 + ... + 3023228.

It is an arithmetic number, because the mean of its divisors is an integer number (2853646740).

Almost surely, 2^21120002111 is an apocalyptic number.

21120002111 is a deficient number, since it is larger than the sum of its proper divisors (1709171809).

21120002111 is a wasteful number, since it uses less digits than its factorization.

21120002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039745.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120002111 its reverse (11120002112), we get a palindrome (32240004223).

Subtracting from 21120002111 its reverse (11120002112), we obtain a palindrome (9999999999).

The spelling of 21120002111 in words is "twenty-one billion, one hundred twenty million, two thousand, one hundred eleven".