20121151111 has 8 divisors (see below), whose sum is σ = 21283601760. Its totient is φ = 18982668672.

The previous prime is 20121151109. The next prime is 20121151151. The reversal of 20121151111 is 11115112102.

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 20121151111 - 2¹ = 20121151109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121151151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5990326 + ... + 5993683.

It is an arithmetic number, because the mean of its divisors is an integer number (2660450220).

Almost surely, 2^20121151111 is an apocalyptic number.

20121151111 is a deficient number, since it is larger than the sum of its proper divisors (1162450649).

20121151111 is a wasteful number, since it uses less digits than its factorization.

20121151111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11984105.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 20121151111 its reverse (11115112102), we get a palindrome (31236263213).

The spelling of 20121151111 in words is "twenty billion, one hundred twenty-one million, one hundred fifty-one thousand, one hundred eleven".