21211110020011 has 4 divisors (see below), whose sum is σ = 21211206877224. Its totient is φ = 21211013162800.

The previous prime is 21211110019987. The next prime is 21211110020059. The reversal of 21211110020011 is 11002001111212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21211110020011 - 2³³ = 21202520085419 is a prime.

It is a super-2 number, since 2×21211110020011² (a number of 27 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 = 21211110019973 and 21211110020000.

It is not an unprimeable number, because it can be changed into a prime (21211110020911) 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, 48099370 + ... + 48538351.

It is an arithmetic number, because the mean of its divisors is an integer number (5302801719306).

Almost surely, 2^{21211110020011} is an apocalyptic number.

21211110020011 is a deficient number, since it is larger than the sum of its proper divisors (96857213).

21211110020011 is an equidigital number, since it uses as much as digits as its factorization.

21211110020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96857212.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211110020011 its reverse (11002001111212), we get a palindrome (32213111131223).

The spelling of 21211110020011 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, twenty thousand, eleven".