21241187638 has 16 divisors (see below), whose sum is σ = 34838968320. Its totient is φ = 9632679400.

The previous prime is 21241187623. The next prime is 21241187641. The reversal of 21241187638 is 83678114212.

It is a junction number, because it is equal to n+sod(n) for n = 21241187594 and 21241187603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110598 + ... + 1129561.

It is an arithmetic number, because the mean of its divisors is an integer number (2177435520).

Almost surely, 2^21241187638 is an apocalyptic number.

21241187638 is a deficient number, since it is larger than the sum of its proper divisors (13597780682).

21241187638 is a wasteful number, since it uses less digits than its factorization.

21241187638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240603.

The product of its digits is 129024, while the sum is 43.

The spelling of 21241187638 in words is "twenty-one billion, two hundred forty-one million, one hundred eighty-seven thousand, six hundred thirty-eight".