1021111111005 has 16 divisors (see below), whose sum is σ = 1633869282240. Its totient is φ = 544562091008.

The previous prime is 1021111111001. The next prime is 1021111111099. The reversal of 1021111111005 is 5001111111201.

It is a cyclic number.

It is not a de Polignac number, because 1021111111005 - 2² = 1021111111001 is a prime.

It is a super-2 number, since 2×1021111111005² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111111001) 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, 1628292 + ... + 2166461.

It is an arithmetic number, because the mean of its divisors is an integer number (102116830140).

Almost surely, 2^{1021111111005} is an apocalyptic number.

1021111111005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021111111005 is a deficient number, since it is larger than the sum of its proper divisors (612758171235).

1021111111005 is a wasteful number, since it uses less digits than its factorization.

1021111111005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812700.

The product of its (nonzero) digits is 10, while the sum is 15.

Adding to 1021111111005 its reverse (5001111111201), we get a palindrome (6022222222206).

The spelling of 1021111111005 in words is "one trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, five".