21660400233211 has 2 divisors, whose sum is σ = 21660400233212. Its totient is φ = 21660400233210.

The previous prime is 21660400233133. The next prime is 21660400233299. The reversal of 21660400233211 is 11233200406612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21660400233211 - 2¹⁵ = 21660400200443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21660400230211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830200116605 + 10830200116606.

It is an arithmetic number, because the mean of its divisors is an integer number (10830200116606).

Almost surely, 2^{21660400233211} is an apocalyptic number.

21660400233211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21660400233211 is an equidigital number, since it uses as much as digits as its factorization.

21660400233211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21660400233211 its reverse (11233200406612), we get a palindrome (32893600639823).

The spelling of 21660400233211 in words is "twenty-one trillion, six hundred sixty billion, four hundred million, two hundred thirty-three thousand, two hundred eleven".