21024237117 has 8 divisors (see below), whose sum is σ = 30188648224. Its totient is φ = 12937992048.

The previous prime is 21024237109. The next prime is 21024237133. The reversal of 21024237117 is 71173242012.

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

It is not a de Polignac number, because 21024237117 - 2³ = 21024237109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024237197) by changing a digit.

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, 269541463 + ... + 269541540.

It is an arithmetic number, because the mean of its divisors is an integer number (3773581028).

Almost surely, 2^21024237117 is an apocalyptic number.

It is an amenable number.

21024237117 is a deficient number, since it is larger than the sum of its proper divisors (9164411107).

21024237117 is a wasteful number, since it uses less digits than its factorization.

21024237117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539083019.

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 21024237117 its reverse (71173242012), we get a palindrome (92197479129).

The spelling of 21024237117 in words is "twenty-one billion, twenty-four million, two hundred thirty-seven thousand, one hundred seventeen".