21798056 has 32 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 9309696.

The previous prime is 21798047. The next prime is 21798061. The reversal of 21798056 is 65089712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23000 + ... + 23928.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^21798056 is an apocalyptic number.

It is an amenable number.

21798056 is an abundant number, since it is smaller than the sum of its proper divisors (25073944).

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

21798056 is a wasteful number, since it uses less digits than its factorization.

21798056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 21798056 is about 4668.8388278029. The cubic root of 21798056 is about 279.3439401965.

The spelling of 21798056 in words is "twenty-one million, seven hundred ninety-eight thousand, fifty-six".