21663603044033 has 4 divisors (see below), whose sum is σ = 21685641298368. Its totient is φ = 21641564789700.

The previous prime is 21663603044023. The next prime is 21663603044047. The reversal of 21663603044033 is 33044030636612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21663603044033 - 2²⁸ = 21663334608577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21663603044023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11019125693 + ... + 11019127658.

It is an arithmetic number, because the mean of its divisors is an integer number (5421410324592).

Almost surely, 2^{21663603044033} is an apocalyptic number.

It is an amenable number.

21663603044033 is a deficient number, since it is larger than the sum of its proper divisors (22038254335).

21663603044033 is an equidigital number, since it uses as much as digits as its factorization.

21663603044033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22038254334.

The product of its (nonzero) digits is 559872, while the sum is 41.

The spelling of 21663603044033 in words is "twenty-one trillion, six hundred sixty-three billion, six hundred three million, forty-four thousand, thirty-three".