21320313211 has 2 divisors, whose sum is σ = 21320313212. Its totient is φ = 21320313210.

The previous prime is 21320313187. The next prime is 21320313229. The reversal of 21320313211 is 11231302312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320313211 - 2¹⁹ = 21319788923 is a prime.

It is a super-2 number, since 2×21320313211² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21320313251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660156605 + 10660156606.

It is an arithmetic number, because the mean of its divisors is an integer number (10660156606).

Almost surely, 2^21320313211 is an apocalyptic number.

21320313211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320313211 is an equidigital number, since it uses as much as digits as its factorization.

21320313211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21320313211 its reverse (11231302312), we get a palindrome (32551615523).

The spelling of 21320313211 in words is "twenty-one billion, three hundred twenty million, three hundred thirteen thousand, two hundred eleven".