21663033554513 has 8 divisors (see below), whose sum is σ = 23344442936808. Its totient is φ = 19983770198784.

The previous prime is 21663033554471. The next prime is 21663033554543. The reversal of 21663033554513 is 31545533036612.

It can be written as a sum of positive squares in 4 ways, for example, as 2786995264 + 21660246559249 = 52792^2 + 4654057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21663033554513 - 2¹⁴ = 21663033538129 is a prime.

It is a super-2 number, since 2×21663033554513² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21663033554543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536485670 + ... + 536526047.

It is an arithmetic number, because the mean of its divisors is an integer number (2918055367101).

Almost surely, 2^{21663033554513} is an apocalyptic number.

It is an amenable number.

21663033554513 is a deficient number, since it is larger than the sum of its proper divisors (1681409382295).

21663033554513 is a wasteful number, since it uses less digits than its factorization.

21663033554513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073013283.

The product of its (nonzero) digits is 2916000, while the sum is 47.

The spelling of 21663033554513 in words is "twenty-one trillion, six hundred sixty-three billion, thirty-three million, five hundred fifty-four thousand, five hundred thirteen".