21444088 has 16 divisors (see below), whose sum is σ = 40268880. Its totient is φ = 10705728.

The previous prime is 21444083. The next prime is 21444091. The reversal of 21444088 is 88044412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444083) 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, 4956 + ... + 8212.

It is an arithmetic number, because the mean of its divisors is an integer number (2516805).

Almost surely, 2^21444088 is an apocalyptic number.

It is an amenable number.

21444088 is a deficient number, since it is larger than the sum of its proper divisors (18824792).

21444088 is a wasteful number, since it uses less digits than its factorization.

21444088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086 (or 4082 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 21444088 is about 4630.7761768412. The cubic root of 21444088 is about 277.8236377735.

The spelling of 21444088 in words is "twenty-one million, four hundred forty-four thousand, eighty-eight".