21013201211 has 4 divisors (see below), whose sum is σ = 21014549712. Its totient is φ = 21011852712.

The previous prime is 21013201207. The next prime is 21013201241. The reversal of 21013201211 is 11210231012.

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 21013201211 - 2² = 21013201207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013201241) 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, 650600 + ... + 682133.

It is an arithmetic number, because the mean of its divisors is an integer number (5253637428).

Almost surely, 2^21013201211 is an apocalyptic number.

21013201211 is a deficient number, since it is larger than the sum of its proper divisors (1348501).

21013201211 is a wasteful number, since it uses less digits than its factorization.

21013201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348500.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21013201211 its reverse (11210231012), we get a palindrome (32223432223).

The spelling of 21013201211 in words is "twenty-one billion, thirteen million, two hundred one thousand, two hundred eleven".