21112020011 has 2 divisors, whose sum is σ = 21112020012. Its totient is φ = 21112020010.

The previous prime is 21112019977. The next prime is 21112020019. The reversal of 21112020011 is 11002021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112020011 - 2²² = 21107825707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112019974 and 21112020001.

It is not a weakly prime, because it can be changed into another prime (21112020019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556010005 + 10556010006.

It is an arithmetic number, because the mean of its divisors is an integer number (10556010006).

Almost surely, 2^21112020011 is an apocalyptic number.

21112020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112020011 is an equidigital number, since it uses as much as digits as its factorization.

21112020011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21112020011 its reverse (11002021112), we get a palindrome (32114041123).

The spelling of 21112020011 in words is "twenty-one billion, one hundred twelve million, twenty thousand, eleven".