21648803575 has 12 divisors (see below), whose sum is σ = 30679447600. Its totient is φ = 14844893760.

The previous prime is 21648803573. The next prime is 21648803599. The reversal of 21648803575 is 57530884612.

It is a happy number.

It is not a de Polignac number, because 21648803575 - 2¹ = 21648803573 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648803573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61853550 + ... + 61853899.

Almost surely, 2^21648803575 is an apocalyptic number.

21648803575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21648803575 is a deficient number, since it is larger than the sum of its proper divisors (9030644025).

21648803575 is a wasteful number, since it uses less digits than its factorization.

21648803575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123707466 (or 123707461 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 21648803575 in words is "twenty-one billion, six hundred forty-eight million, eight hundred three thousand, five hundred seventy-five".