10121111111 has 8 divisors (see below), whose sum is σ = 10430999040. Its totient is φ = 9814610232.

The previous prime is 10121111101. The next prime is 10121111191. The reversal of 10121111111 is 11111112101.

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 a de Polignac number, because none of the positive numbers 2^k-10121111111 is a prime.

It is a Duffinian number.

10121111111 is a modest number, since divided by 111111 gives 10121 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10121111092 and 10121111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121111101) 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, 840695 + ... + 852648.

It is an arithmetic number, because the mean of its divisors is an integer number (1303874880).

Almost surely, 2^10121111111 is an apocalyptic number.

10121111111 is a deficient number, since it is larger than the sum of its proper divisors (309887929).

10121111111 is a wasteful number, since it uses less digits than its factorization.

10121111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693525.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 10121111111 its reverse (11111112101), we get a palindrome (21232223212).

It can be divided in two parts, 10 and 121111111, that added together give a palindrome (121111121).

The spelling of 10121111111 in words is "ten billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".