21002320211 has 16 divisors (see below), whose sum is σ = 22306060800. Its totient is φ = 19731716928.

The previous prime is 21002320153. The next prime is 21002320243. The reversal of 21002320211 is 11202320012.

It is a happy number.

It is not a de Polignac number, because 21002320211 - 2⁶ = 21002320147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002320411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1743170 + ... + 1755176.

It is an arithmetic number, because the mean of its divisors is an integer number (1394128800).

Almost surely, 2^21002320211 is an apocalyptic number.

21002320211 is a deficient number, since it is larger than the sum of its proper divisors (1303740589).

21002320211 is a wasteful number, since it uses less digits than its factorization.

21002320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002320211 its reverse (11202320012), we get a palindrome (32204640223).

The spelling of 21002320211 in words is "twenty-one billion, two million, three hundred twenty thousand, two hundred eleven".