1002111202021 has 4 divisors (see below), whose sum is σ = 1002116728044. Its totient is φ = 1002105676000.

The previous prime is 1002111201991. The next prime is 1002111202033. The reversal of 1002111202021 is 1202021112001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 612753921796 + 389357280225 = 782786^2 + 623985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002111202021 - 2¹⁵ = 1002111169253 is a prime.

It is a super-2 number, since 2×1002111202021² (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 = 1002111201992 and 1002111202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002111902021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481430 + ... + 2856871.

It is an arithmetic number, because the mean of its divisors is an integer number (250529182011).

Almost surely, 2^{1002111202021} is an apocalyptic number.

It is an amenable number.

1002111202021 is a deficient number, since it is larger than the sum of its proper divisors (5526023).

1002111202021 is an equidigital number, since it uses as much as digits as its factorization.

1002111202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1002111202021 its reverse (1202021112001), we get a palindrome (2204132314022).

The spelling of 1002111202021 in words is "one trillion, two billion, one hundred eleven million, two hundred two thousand, twenty-one".