21923558345 has 8 divisors (see below), whose sum is σ = 28331983176. Its totient is φ = 16189704576.

The previous prime is 21923558333. The next prime is 21923558351. The reversal of 21923558345 is 54385532912.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 489427129 + 21434131216 = 22123^2 + 146404^2 .

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 21923558345 - 2¹² = 21923554249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21923558345.

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, 168642692 + ... + 168642821.

It is an arithmetic number, because the mean of its divisors is an integer number (3541497897).

Almost surely, 2^21923558345 is an apocalyptic number.

It is an amenable number.

21923558345 is a deficient number, since it is larger than the sum of its proper divisors (6408424831).

21923558345 is a wasteful number, since it uses less digits than its factorization.

21923558345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337285531.

The product of its digits is 1296000, while the sum is 47.

The spelling of 21923558345 in words is "twenty-one billion, nine hundred twenty-three million, five hundred fifty-eight thousand, three hundred forty-five".