20121020111 has 8 divisors (see below), whose sum is σ = 20437119024. Its totient is φ = 19805385600.

The previous prime is 20121020069. The next prime is 20121020147. The reversal of 20121020111 is 11102012102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121020111 - 2¹⁸ = 20120757967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121020092 and 20121020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121020411) 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, 28250 + ... + 202583.

It is an arithmetic number, because the mean of its divisors is an integer number (2554639878).

Almost surely, 2^20121020111 is an apocalyptic number.

20121020111 is a deficient number, since it is larger than the sum of its proper divisors (316098913).

20121020111 is a wasteful number, since it uses less digits than its factorization.

20121020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232201.

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

Adding to 20121020111 its reverse (11102012102), we get a palindrome (31223032213).

The spelling of 20121020111 in words is "twenty billion, one hundred twenty-one million, twenty thousand, one hundred eleven".