21341215211 has 4 divisors (see below), whose sum is σ = 21341544312. Its totient is φ = 21340886112.

The previous prime is 21341215187. The next prime is 21341215241. The reversal of 21341215211 is 11251214312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21341215211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341215241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31325 + ... + 208958.

It is an arithmetic number, because the mean of its divisors is an integer number (5335386078).

Almost surely, 2^21341215211 is an apocalyptic number.

21341215211 is a deficient number, since it is larger than the sum of its proper divisors (329101).

21341215211 is an equidigital number, since it uses as much as digits as its factorization.

21341215211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329100.

The product of its digits is 480, while the sum is 23.

Adding to 21341215211 its reverse (11251214312), we get a palindrome (32592429523).

The spelling of 21341215211 in words is "twenty-one billion, three hundred forty-one million, two hundred fifteen thousand, two hundred eleven".