1020021111105 has 16 divisors (see below), whose sum is σ = 1647006567360. Its totient is φ = 539020329408.

The previous prime is 1020021111089. The next prime is 1020021111119. The reversal of 1020021111105 is 5011111200201.

It is not a de Polignac number, because 1020021111105 - 2⁴ = 1020021111089 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311931427 + ... + 311934696.

It is an arithmetic number, because the mean of its divisors is an integer number (102937910460).

Almost surely, 2^{1020021111105} is an apocalyptic number.

1020021111105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020021111105 is a deficient number, since it is larger than the sum of its proper divisors (626985456255).

1020021111105 is a wasteful number, since it uses less digits than its factorization.

1020021111105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623866240.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 1020021111105 its reverse (5011111200201), we get a palindrome (6031132311306).

The spelling of 1020021111105 in words is "one trillion, twenty billion, twenty-one million, one hundred eleven thousand, one hundred five".