21413088 has 72 divisors (see below), whose sum is σ = 61425000. Its totient is φ = 7075584.

The previous prime is 21413083. The next prime is 21413099. The reversal of 21413088 is 88031412.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42663 + ... + 43161.

It is an arithmetic number, because the mean of its divisors is an integer number (853125).

Almost surely, 2^21413088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30712500).

21413088 is an abundant number, since it is smaller than the sum of its proper divisors (40011912).

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

21413088 is a wasteful number, since it uses less digits than its factorization.

21413088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21413088 is about 4627.4277952227. The cubic root of 21413088 is about 277.6896974188.

The spelling of 21413088 in words is "twenty-one million, four hundred thirteen thousand, eighty-eight".