21428792394174 has 128 divisors (see below), whose sum is σ = 53656026255360. Its totient is φ = 6280391116800.

The previous prime is 21428792394089. The next prime is 21428792394239. The reversal of 21428792394174 is 47149329782412.

21428792394174 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 8 + 79 + 2 + 394 + 174 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30905682 + ... + 31591434.

It is an arithmetic number, because the mean of its divisors is an integer number (419187705120).

Almost surely, 2^{21428792394174} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21428792394174, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26828013127680).

21428792394174 is an abundant number, since it is smaller than the sum of its proper divisors (32227233861186).

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

21428792394174 is a wasteful number, since it uses less digits than its factorization.

21428792394174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687503 (or 687497 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 21428792394174 in words is "twenty-one trillion, four hundred twenty-eight billion, seven hundred ninety-two million, three hundred ninety-four thousand, one hundred seventy-four".