21794144 has 12 divisors (see below), whose sum is σ = 42907284. Its totient is φ = 10897056.

The previous prime is 21794137. The next prime is 21794173. The reversal of 21794144 is 44149712.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 681067 = 21794144 / (2 + 1 + 7 + 9 + 4 + 1 + 4 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 21794144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340502 + ... + 340565.

It is an arithmetic number, because the mean of its divisors is an integer number (3575607).

Almost surely, 2^21794144 is an apocalyptic number.

It is an amenable number.

21794144 is a deficient number, since it is larger than the sum of its proper divisors (21113140).

21794144 is an equidigital number, since it uses as much as digits as its factorization.

21794144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681077 (or 681069 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 21794144 is about 4668.4198611522. The cubic root of 21794144 is about 279.3272283259.

The spelling of 21794144 in words is "twenty-one million, seven hundred ninety-four thousand, one hundred forty-four".