21798088 has 16 divisors (see below), whose sum is σ = 44015580. Its totient is φ = 10060608.

The previous prime is 21798067. The next prime is 21798107. The reversal of 21798088 is 88089712.

It can be written as a sum of positive squares in 2 ways, for example, as 21696964 + 101124 = 4658^2 + 318^2 .

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 3 ways as a sum of consecutive naturals, for example, 104695 + ... + 104902.

Almost surely, 2^21798088 is an apocalyptic number.

It is an amenable number.

21798088 is an abundant number, since it is smaller than the sum of its proper divisors (22217492).

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

21798088 is a wasteful number, since it uses less digits than its factorization.

21798088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209616 (or 209612 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 21798088 is about 4668.8422547779. The cubic root of 21798088 is about 279.3440768907.

The spelling of 21798088 in words is "twenty-one million, seven hundred ninety-eight thousand, eighty-eight".