20121013111 has 8 divisors (see below), whose sum is σ = 21231750240. Its totient is φ = 19029935232.

The previous prime is 20121013069. The next prime is 20121013117. The reversal of 20121013111 is 11131012102.

It is a happy number.

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 20121013111 - 2²⁵ = 20087458679 is a prime.

It is a super-2 number, since 2×20121013111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121013091 and 20121013100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121013117) 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, 4912710 + ... + 4916803.

It is an arithmetic number, because the mean of its divisors is an integer number (2653968780).

Almost surely, 2^20121013111 is an apocalyptic number.

20121013111 is a deficient number, since it is larger than the sum of its proper divisors (1110737129).

20121013111 is an equidigital number, since it uses as much as digits as its factorization.

20121013111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9829625.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20121013111 its reverse (11131012102), we get a palindrome (31252025213).

The spelling of 20121013111 in words is "twenty billion, one hundred twenty-one million, thirteen thousand, one hundred eleven".