21628843804 has 6 divisors (see below), whose sum is σ = 37850476664. Its totient is φ = 10814421900.

The previous prime is 21628843801. The next prime is 21628843811. The reversal of 21628843804 is 40834882612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21628843801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703605472 + ... + 2703605479.

Almost surely, 2^21628843804 is an apocalyptic number.

It is an amenable number.

21628843804 is a deficient number, since it is larger than the sum of its proper divisors (16221632860).

21628843804 is a wasteful number, since it uses less digits than its factorization.

21628843804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407210955 (or 5407210953 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 21628843804 in words is "twenty-one billion, six hundred twenty-eight million, eight hundred forty-three thousand, eight hundred four".