21144088 has 24 divisors (see below), whose sum is σ = 46118700. Its totient is φ = 9061584.

The previous prime is 21144083. The next prime is 21144119. The reversal of 21144088 is 88044112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26578 + ... + 27361.

Almost surely, 2^21144088 is an apocalyptic number.

21144088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21144088 is an abundant number, since it is smaller than the sum of its proper divisors (24974612).

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

21144088 is a wasteful number, since it uses less digits than its factorization.

21144088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53959 (or 53948 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21144088 is about 4598.2701095086. The cubic root of 21144088 is about 276.5219765687.

The spelling of 21144088 in words is "twenty-one million, one hundred forty-four thousand, eighty-eight".