21112020002011 has 4 divisors (see below), whose sum is σ = 21178619434512. Its totient is φ = 21045420569512.

The previous prime is 21112020001973. The next prime is 21112020002033. The reversal of 21112020002011 is 11020002021112.

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

It is not a de Polignac number, because 21112020002011 - 2¹³ = 21112019993819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112020001982 and 21112020002000.

It is not an unprimeable number, because it can be changed into a prime (21112020002041) 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, 33299715775 + ... + 33299716408.

It is an arithmetic number, because the mean of its divisors is an integer number (5294654858628).

Almost surely, 2^{21112020002011} is an apocalyptic number.

21112020002011 is a deficient number, since it is larger than the sum of its proper divisors (66599432501).

21112020002011 is an equidigital number, since it uses as much as digits as its factorization.

21112020002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66599432500.

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

Adding to 21112020002011 its reverse (11020002021112), we get a palindrome (32132022023123).

The spelling of 21112020002011 in words is "twenty-one trillion, one hundred twelve billion, twenty million, two thousand, eleven".