21230232211 has 2 divisors, whose sum is σ = 21230232212. Its totient is φ = 21230232210.

The previous prime is 21230232197. The next prime is 21230232223. The reversal of 21230232211 is 11223203212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21230232211 - 2¹⁵ = 21230199443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230232251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615116105 + 10615116106.

It is an arithmetic number, because the mean of its divisors is an integer number (10615116106).

Almost surely, 2^21230232211 is an apocalyptic number.

21230232211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230232211 is an equidigital number, since it uses as much as digits as its factorization.

21230232211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21230232211 its reverse (11223203212), we get a palindrome (32453435423).

The spelling of 21230232211 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-two thousand, two hundred eleven".