1021110011111 has 4 divisors (see below), whose sum is σ = 1022849551752. Its totient is φ = 1019370470472.

The previous prime is 1021110011093. The next prime is 1021110011161. The reversal of 1021110011111 is 1111100111201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021110011111 is a prime.

It is a super-2 number, since 2×1021110011111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021110011092 and 1021110011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021110011161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869769440 + ... + 869770613.

It is an arithmetic number, because the mean of its divisors is an integer number (255712387938).

Almost surely, 2^{1021110011111} is an apocalyptic number.

1021110011111 is a deficient number, since it is larger than the sum of its proper divisors (1739540641).

1021110011111 is an equidigital number, since it uses as much as digits as its factorization.

1021110011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739540640.

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

Adding to 1021110011111 its reverse (1111100111201), we get a palindrome (2132210122312).

The spelling of 1021110011111 in words is "one trillion, twenty-one billion, one hundred ten million, eleven thousand, one hundred eleven".