21395878146186 has 32 divisors (see below), whose sum is σ = 42802188324480. Its totient is φ = 7130220953856.

The previous prime is 21395878146121. The next prime is 21395878146217. The reversal of 21395878146186 is 68164187859312.

It is a self number, because there is not a number n which added to its sum of digits gives 21395878146186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503921070 + ... + 503963526.

It is an arithmetic number, because the mean of its divisors is an integer number (1337568385140).

Almost surely, 2^{21395878146186} is an apocalyptic number.

21395878146186 is an abundant number, since it is smaller than the sum of its proper divisors (21406310178294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21395878146186 is a wasteful number, since it uses less digits than its factorization.

21395878146186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60958.

The product of its digits is 139345920, while the sum is 69.

The spelling of 21395878146186 in words is "twenty-one trillion, three hundred ninety-five billion, eight hundred seventy-eight million, one hundred forty-six thousand, one hundred eighty-six".