1000111100021 has 16 divisors (see below), whose sum is σ = 1091886421248. Its totient is φ = 908478792000.

The previous prime is 1000111099991. The next prime is 1000111100041. The reversal of 1000111100021 is 1200011110001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1000111100021 - 2²⁶ = 1000043991157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000111099981 and 1000111100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000111100041) 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 15 ways as a sum of consecutive naturals, for example, 99637415 + ... + 99647451.

It is an arithmetic number, because the mean of its divisors is an integer number (68242901328).

Almost surely, 2^{1000111100021} is an apocalyptic number.

1000111100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1000111100021 is a deficient number, since it is larger than the sum of its proper divisors (91775321227).

1000111100021 is a wasteful number, since it uses less digits than its factorization.

1000111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16252.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1000111100021 its reverse (1200011110001), we get a palindrome (2200122210022).

The spelling of 1000111100021 in words is "one trillion, one hundred eleven million, one hundred thousand, twenty-one".