21320122211 has 2 divisors, whose sum is σ = 21320122212. Its totient is φ = 21320122210.

The previous prime is 21320122207. The next prime is 21320122231. The reversal of 21320122211 is 11222102312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320122211 - 2² = 21320122207 is a prime.

It is a super-2 number, since 2×21320122211² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21320122211.

It is not a weakly prime, because it can be changed into another prime (21320122231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660061105 + 10660061106.

It is an arithmetic number, because the mean of its divisors is an integer number (10660061106).

Almost surely, 2^21320122211 is an apocalyptic number.

21320122211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320122211 is an equidigital number, since it uses as much as digits as its factorization.

21320122211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21320122211 its reverse (11222102312), we get a palindrome (32542224523).

The spelling of 21320122211 in words is "twenty-one billion, three hundred twenty million, one hundred twenty-two thousand, two hundred eleven".