21490120717 has 8 divisors (see below), whose sum is σ = 23635616256. Its totient is φ = 19414969392.

The previous prime is 21490120709. The next prime is 21490120741. The reversal of 21490120717 is 71702109412.

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

It is not a de Polignac number, because 21490120717 - 2³ = 21490120709 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 (21490120117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17585413 + ... + 17586634.

It is an arithmetic number, because the mean of its divisors is an integer number (2954452032).

Almost surely, 2^21490120717 is an apocalyptic number.

It is an amenable number.

21490120717 is a deficient number, since it is larger than the sum of its proper divisors (2145495539).

21490120717 is a wasteful number, since it uses less digits than its factorization.

21490120717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35172107.

The product of its (nonzero) digits is 7056, while the sum is 34.

The spelling of 21490120717 in words is "twenty-one billion, four hundred ninety million, one hundred twenty thousand, seven hundred seventeen".