21110020211211 has 4 divisors (see below), whose sum is σ = 28146693614952. Its totient is φ = 14073346807472.

The previous prime is 21110020211183. The next prime is 21110020211233. The reversal of 21110020211211 is 11211202001112.

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 21110020211211 - 2⁷ = 21110020211083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110020281211) 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, 3518336701866 + ... + 3518336701871.

It is an arithmetic number, because the mean of its divisors is an integer number (7036673403738).

Almost surely, 2^{21110020211211} is an apocalyptic number.

21110020211211 is a deficient number, since it is larger than the sum of its proper divisors (7036673403741).

21110020211211 is an equidigital number, since it uses as much as digits as its factorization.

21110020211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036673403740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110020211211 its reverse (11211202001112), we get a palindrome (32321222212323).

The spelling of 21110020211211 in words is "twenty-one trillion, one hundred ten billion, twenty million, two hundred eleven thousand, two hundred eleven".