1111111110021 has 16 divisors (see below), whose sum is σ = 1616179383360. Its totient is φ = 673393269120.

The previous prime is 1111111110017. The next prime is 1111111110041. The reversal of 1111111110021 is 1200111111111.

It is not a de Polignac number, because 1111111110021 - 2² = 1111111110017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111111109979 and 1111111110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111111110041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5202681 + ... + 5412033.

It is an arithmetic number, because the mean of its divisors is an integer number (101011211460).

Almost surely, 2^{1111111110021} is an apocalyptic number.

1111111110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111111110021 is a deficient number, since it is larger than the sum of its proper divisors (505068273339).

1111111110021 is a wasteful number, since it uses less digits than its factorization.

1111111110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370196.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 1111111110021 its reverse (1200111111111), we get a palindrome (2311222221132).

The spelling of 1111111110021 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred ten thousand, twenty-one".