21241012165 has 8 divisors (see below), whose sum is σ = 25490170368. Its totient is φ = 16992172560.

The previous prime is 21241012153. The next prime is 21241012189. The reversal of 21241012165 is 56121014212.

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

It is not a de Polignac number, because 21241012165 - 2⁹ = 21241011653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106644 + ... + 232066.

It is an arithmetic number, because the mean of its divisors is an integer number (3186271296).

Almost surely, 2^21241012165 is an apocalyptic number.

It is an amenable number.

21241012165 is a deficient number, since it is larger than the sum of its proper divisors (4249158203).

21241012165 is a wasteful number, since it uses less digits than its factorization.

21241012165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159299.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21241012165 its reverse (56121014212), we get a palindrome (77362026377).

The spelling of 21241012165 in words is "twenty-one billion, two hundred forty-one million, twelve thousand, one hundred sixty-five".