21088044 has 18 divisors (see below), whose sum is σ = 53305980. Its totient is φ = 7029336.

The previous prime is 21088013. The next prime is 21088057. The reversal of 21088044 is 44088012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21087999 and 21088017.

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 5 ways as a sum of consecutive naturals, for example, 292854 + ... + 292925.

Almost surely, 2^21088044 is an apocalyptic number.

It is an amenable number.

21088044 is an abundant number, since it is smaller than the sum of its proper divisors (32217936).

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

21088044 is a wasteful number, since it uses less digits than its factorization.

21088044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585789 (or 585784 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21088044 is about 4592.1720351050. The cubic root of 21088044 is about 276.2774462742.

The spelling of 21088044 in words is "twenty-one million, eighty-eight thousand, forty-four".