21663411150533 has 2 divisors, whose sum is σ = 21663411150534. Its totient is φ = 21663411150532.

The previous prime is 21663411150481. The next prime is 21663411150571. The reversal of 21663411150533 is 33505111436612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10965913036324 + 10697498114209 = 3311482^2 + 3270703^2 .

It is a cyclic number.

It is not a de Polignac number, because 21663411150533 - 2¹⁴ = 21663411134149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21663411152533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831705575266 + 10831705575267.

It is an arithmetic number, because the mean of its divisors is an integer number (10831705575267).

Almost surely, 2^{21663411150533} is an apocalyptic number.

It is an amenable number.

21663411150533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21663411150533 is an equidigital number, since it uses as much as digits as its factorization.

21663411150533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 21663411150533 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred fifty thousand, five hundred thirty-three".