21110403211 has 4 divisors (see below), whose sum is σ = 21110853024. Its totient is φ = 21109953400.

The previous prime is 21110403199. The next prime is 21110403229. The reversal of 21110403211 is 11230401112.

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 21110403211 - 2³³ = 12520468619 is a prime.

It is a super-2 number, since 2×21110403211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110403241) 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, 145060 + ... + 251521.

It is an arithmetic number, because the mean of its divisors is an integer number (5277713256).

Almost surely, 2^21110403211 is an apocalyptic number.

21110403211 is a deficient number, since it is larger than the sum of its proper divisors (449813).

21110403211 is an equidigital number, since it uses as much as digits as its factorization.

21110403211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449812.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21110403211 its reverse (11230401112), we get a palindrome (32340804323).

The spelling of 21110403211 in words is "twenty-one billion, one hundred ten million, four hundred three thousand, two hundred eleven".