21088088 has 16 divisors (see below), whose sum is σ = 45188880. Its totient is φ = 9037728.

The previous prime is 21088087. The next prime is 21088141. The reversal of 21088088 is 88088012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088087) by changing a digit.

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, 188231 + ... + 188342.

It is an arithmetic number, because the mean of its divisors is an integer number (2824305).

Almost surely, 2^21088088 is an apocalyptic number.

21088088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21088088 is an abundant number, since it is smaller than the sum of its proper divisors (24100792).

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

21088088 is a wasteful number, since it uses less digits than its factorization.

21088088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376586 (or 376582 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 21088088 is about 4592.1768258637. The cubic root of 21088088 is about 276.2776384242.

The spelling of 21088088 in words is "twenty-one million, eighty-eight thousand, eighty-eight".