21578055308146 has 8 divisors (see below), whose sum is σ = 33156524010204. Its totient is φ = 10525880638080.

The previous prime is 21578055308137. The next prime is 21578055308167. The reversal of 21578055308146 is 64180355087512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18858079222921 + 2719976085225 = 4342589^2 + 1649235^2 .

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

It is a super-2 number, since 2×21578055308146² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 131573507895 + ... + 131573508058.

Almost surely, 2^{21578055308146} is an apocalyptic number.

21578055308146 is a deficient number, since it is larger than the sum of its proper divisors (11578468702058).

21578055308146 is a wasteful number, since it uses less digits than its factorization.

21578055308146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263147015996.

The product of its (nonzero) digits is 8064000, while the sum is 55.

The spelling of 21578055308146 in words is "twenty-one trillion, five hundred seventy-eight billion, fifty-five million, three hundred eight thousand, one hundred forty-six".