20121002111 has 8 divisors (see below), whose sum is σ = 23788377120. Its totient is φ = 16651863648.

The previous prime is 20121002101. The next prime is 20121002113. The reversal of 20121002111 is 11120012102.

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

It is not a de Polignac number, because 20121002111 - 2²² = 20116807807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121002092 and 20121002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121002113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49558916 + ... + 49559321.

It is an arithmetic number, because the mean of its divisors is an integer number (2973547140).

Almost surely, 2^20121002111 is an apocalyptic number.

20121002111 is a deficient number, since it is larger than the sum of its proper divisors (3667375009).

20121002111 is an equidigital number, since it uses as much as digits as its factorization.

20121002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99118273.

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

Adding to 20121002111 its reverse (11120012102), we get a palindrome (31241014213).

Subtracting from 20121002111 its reverse (11120012102), we obtain a palindrome (9000990009).

The spelling of 20121002111 in words is "twenty billion, one hundred twenty-one million, two thousand, one hundred eleven".