21033245663 has 8 divisors (see below), whose sum is σ = 21653283120. Its totient is φ = 20415922560.

The previous prime is 21033245627. The next prime is 21033245771. The reversal of 21033245663 is 36654233012.

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 21033245663 - 2⁸ = 21033245407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033245063) 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, 662858 + ... + 693863.

It is an arithmetic number, because the mean of its divisors is an integer number (2706660390).

Almost surely, 2^21033245663 is an apocalyptic number.

21033245663 is a deficient number, since it is larger than the sum of its proper divisors (620037457).

21033245663 is a wasteful number, since it uses less digits than its factorization.

21033245663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357177.

The product of its (nonzero) digits is 77760, while the sum is 35.

Adding to 21033245663 its reverse (36654233012), we get a palindrome (57687478675).

The spelling of 21033245663 in words is "twenty-one billion, thirty-three million, two hundred forty-five thousand, six hundred sixty-three".