21150664559 has 2 divisors, whose sum is σ = 21150664560. Its totient is φ = 21150664558.

The previous prime is 21150664537. The next prime is 21150664573. The reversal of 21150664559 is 95546605112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150664559 - 2⁸ = 21150664303 is a prime.

It is a super-2 number, since 2×21150664559² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150664519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575332279 + 10575332280.

It is an arithmetic number, because the mean of its divisors is an integer number (10575332280).

Almost surely, 2^21150664559 is an apocalyptic number.

21150664559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150664559 is an equidigital number, since it uses as much as digits as its factorization.

21150664559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 21150664559 in words is "twenty-one billion, one hundred fifty million, six hundred sixty-four thousand, five hundred fifty-nine".