21598496345 has 8 divisors (see below), whose sum is σ = 27442795464. Its totient is φ = 16262397184.

The previous prime is 21598496321. The next prime is 21598496351. The reversal of 21598496345 is 54369489512.

It can be written as a sum of positive squares in 4 ways, for example, as 11211421456 + 10387074889 = 105884^2 + 101917^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21598496345 - 2⁶ = 21598496281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 127049894 + ... + 127050063.

It is an arithmetic number, because the mean of its divisors is an integer number (3430349433).

Almost surely, 2^21598496345 is an apocalyptic number.

It is an amenable number.

21598496345 is a deficient number, since it is larger than the sum of its proper divisors (5844299119).

21598496345 is a wasteful number, since it uses less digits than its factorization.

21598496345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254099979.

The product of its digits is 9331200, while the sum is 56.

The spelling of 21598496345 in words is "twenty-one billion, five hundred ninety-eight million, four hundred ninety-six thousand, three hundred forty-five".