20121300111 has 32 divisors (see below), whose sum is σ = 29460381696. Its totient is φ = 12114476000.

The previous prime is 20121300061. The next prime is 20121300131. The reversal of 20121300111 is 11100312102.

It is not a de Polignac number, because 20121300111 - 2¹⁰ = 20121299087 is a prime.

It is a super-2 number, since 2×20121300111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121300131) 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 31 ways as a sum of consecutive naturals, for example, 5967256 + ... + 5970626.

It is an arithmetic number, because the mean of its divisors is an integer number (920636928).

Almost surely, 2^20121300111 is an apocalyptic number.

20121300111 is a deficient number, since it is larger than the sum of its proper divisors (9339081585).

20121300111 is a wasteful number, since it uses less digits than its factorization.

20121300111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

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

Adding to 20121300111 its reverse (11100312102), we get a palindrome (31221612213).

It can be divided in two parts, 201 and 21300111, that added together give a palindrome (21300312).

The spelling of 20121300111 in words is "twenty billion, one hundred twenty-one million, three hundred thousand, one hundred eleven".