21663411150211 has 16 divisors (see below), whose sum is σ = 21969560358144. Its totient is φ = 21358357129504.

The previous prime is 21663411150179. The next prime is 21663411150217. The reversal of 21663411150211 is 11205111436612.

It is a cyclic number.

It is not a de Polignac number, because 21663411150211 - 2⁵ = 21663411150179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21663411150217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181304490 + ... + 181423936.

It is an arithmetic number, because the mean of its divisors is an integer number (1373097522384).

Almost surely, 2^{21663411150211} is an apocalyptic number.

21663411150211 is a deficient number, since it is larger than the sum of its proper divisors (306149207933).

21663411150211 is a wasteful number, since it uses less digits than its factorization.

21663411150211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124010.

The product of its (nonzero) digits is 8640, while the sum is 34.

Adding to 21663411150211 its reverse (11205111436612), we get a palindrome (32868522586823).

The spelling of 21663411150211 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred fifty thousand, two hundred eleven".