21315043211 has 16 divisors (see below), whose sum is σ = 26578851840. Its totient is φ = 16606466880.

The previous prime is 21315043199. The next prime is 21315043219. The reversal of 21315043211 is 11234051312.

It is a cyclic number.

It is not a de Polignac number, because 21315043211 - 2¹⁴ = 21315026827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21315043219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561350 + ... + 598116.

It is an arithmetic number, because the mean of its divisors is an integer number (1661178240).

Almost surely, 2^21315043211 is an apocalyptic number.

21315043211 is a deficient number, since it is larger than the sum of its proper divisors (5263808629).

21315043211 is a wasteful number, since it uses less digits than its factorization.

21315043211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44314.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21315043211 its reverse (11234051312), we get a palindrome (32549094523).

The spelling of 21315043211 in words is "twenty-one billion, three hundred fifteen million, forty-three thousand, two hundred eleven".