21040320211 has 4 divisors (see below), whose sum is σ = 21608977552. Its totient is φ = 20471662872.

The previous prime is 21040320209. The next prime is 21040320221. The reversal of 21040320211 is 11202304012.

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 21040320211 - 2¹ = 21040320209 is a prime.

It is a super-3 number, since 3×21040320211³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040320221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284328615 + ... + 284328688.

It is an arithmetic number, because the mean of its divisors is an integer number (5402244388).

Almost surely, 2^21040320211 is an apocalyptic number.

21040320211 is a deficient number, since it is larger than the sum of its proper divisors (568657341).

21040320211 is an equidigital number, since it uses as much as digits as its factorization.

21040320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568657340.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21040320211 its reverse (11202304012), we get a palindrome (32242624223).

The spelling of 21040320211 in words is "twenty-one billion, forty million, three hundred twenty thousand, two hundred eleven".