21203301211 has 4 divisors (see below), whose sum is σ = 21603363552. Its totient is φ = 20803238872.

The previous prime is 21203301173. The next prime is 21203301227. The reversal of 21203301211 is 11210330212.

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 21203301211 - 2¹⁹ = 21202776923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203301281) 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, 200031091 + ... + 200031196.

It is an arithmetic number, because the mean of its divisors is an integer number (5400840888).

Almost surely, 2^21203301211 is an apocalyptic number.

21203301211 is a deficient number, since it is larger than the sum of its proper divisors (400062341).

21203301211 is an equidigital number, since it uses as much as digits as its factorization.

21203301211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400062340.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21203301211 its reverse (11210330212), we get a palindrome (32413631423).

The spelling of 21203301211 in words is "twenty-one billion, two hundred three million, three hundred one thousand, two hundred eleven".