21998927804 has 12 divisors (see below), whose sum is σ = 43997855664. Its totient is φ = 9428111904.

The previous prime is 21998927803. The next prime is 21998927813. The reversal of 21998927804 is 40872989912.

21998927804 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21998927803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392837969 + ... + 392838024.

It is an arithmetic number, because the mean of its divisors is an integer number (3666487972).

Almost surely, 2^21998927804 is an apocalyptic number.

It is an amenable number.

21998927804 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.

21998927804 is a wasteful number, since it uses less digits than its factorization.

21998927804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785676004 (or 785676002 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 21998927804 in words is "twenty-one billion, nine hundred ninety-eight million, nine hundred twenty-seven thousand, eight hundred four".