21188603049 has 8 divisors (see below), whose sum is σ = 28531188672. Its totient is φ = 13985876400.

The previous prime is 21188602973. The next prime is 21188603071. The reversal of 21188603049 is 94030688112.

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

It is not a de Polignac number, because 21188603049 - 2¹⁵ = 21188570281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21188603049.

It is not an unprimeable number, because it can be changed into a prime (21188653049) 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 7 ways as a sum of consecutive naturals, for example, 34964389 + ... + 34964994.

It is an arithmetic number, because the mean of its divisors is an integer number (3566398584).

Almost surely, 2^21188603049 is an apocalyptic number.

It is an amenable number.

21188603049 is a deficient number, since it is larger than the sum of its proper divisors (7342585623).

21188603049 is a wasteful number, since it uses less digits than its factorization.

21188603049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69929487.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21188603049 in words is "twenty-one billion, one hundred eighty-eight million, six hundred three thousand, forty-nine".