21894595414638 has 8 divisors (see below), whose sum is σ = 43789190829288. Its totient is φ = 7298198471544.

The previous prime is 21894595414583. The next prime is 21894595414667. The reversal of 21894595414638 is 83641459549812.

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

21894595414638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824549617881 + ... + 1824549617892.

It is an arithmetic number, because the mean of its divisors is an integer number (5473648853661).

Almost surely, 2^{21894595414638} is an apocalyptic number.

21894595414638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21894595414638 is a wasteful number, since it uses less digits than its factorization.

21894595414638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649099235778.

The product of its digits is 298598400, while the sum is 69.

The spelling of 21894595414638 in words is "twenty-one trillion, eight hundred ninety-four billion, five hundred ninety-five million, four hundred fourteen thousand, six hundred thirty-eight".