2100000021011 has 4 divisors (see below), whose sum is σ = 2105134495800. Its totient is φ = 2094865546224.

The previous prime is 2100000020999. The next prime is 2100000021023. The reversal of 2100000021011 is 1101200000012.

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

It is an interprime number because it is at equal distance from previous prime (2100000020999) and next prime (2100000021023).

It is a cyclic number.

It is not a de Polignac number, because 2100000021011 - 2¹⁰ = 2100000019987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100000021011.

It is not an unprimeable number, because it can be changed into a prime (2100000021311) 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, 2567236781 + ... + 2567237598.

It is an arithmetic number, because the mean of its divisors is an integer number (526283623950).

Almost surely, 2^{2100000021011} is an apocalyptic number.

2100000021011 is a deficient number, since it is larger than the sum of its proper divisors (5134474789).

2100000021011 is an equidigital number, since it uses as much as digits as its factorization.

2100000021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134474788.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 2100000021011 its reverse (1101200000012), we get a palindrome (3201200021023).

The spelling of 2100000021011 in words is "two trillion, one hundred billion, twenty-one thousand, eleven".