21266592 has 96 divisors (see below), whose sum is σ = 60201792. Its totient is φ = 6549504.

The previous prime is 21266561. The next prime is 21266603. The reversal of 21266592 is 29566212.

It is a tau number, because it is divible by the number of its divisors (96).

Its product of digits (12960) is a multiple of the sum of its prime factors (270).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135378 + ... + 135534.

It is an arithmetic number, because the mean of its divisors is an integer number (627102).

Almost surely, 2^21266592 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 21266592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30100896).

21266592 is an abundant number, since it is smaller than the sum of its proper divisors (38935200).

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

21266592 is a wasteful number, since it uses less digits than its factorization.

21266592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 262 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21266592 is about 4611.5715325689. The cubic root of 21266592 is about 277.0549835028.

The spelling of 21266592 in words is "twenty-one million, two hundred sixty-six thousand, five hundred ninety-two".