21717243454 has 8 divisors (see below), whose sum is σ = 33062072328. Its totient is φ = 10696552680.

The previous prime is 21717243451. The next prime is 21717243461. The reversal of 21717243454 is 45434271712.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21717243451) 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 3 ways as a sum of consecutive naturals, for example, 81034357 + ... + 81034624.

It is an arithmetic number, because the mean of its divisors is an integer number (4132759041).

Almost surely, 2^21717243454 is an apocalyptic number.

21717243454 is a deficient number, since it is larger than the sum of its proper divisors (11344828874).

21717243454 is a wasteful number, since it uses less digits than its factorization.

21717243454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162069050.

The product of its digits is 188160, while the sum is 40.

The spelling of 21717243454 in words is "twenty-one billion, seven hundred seventeen million, two hundred forty-three thousand, four hundred fifty-four".