21055792 has 40 divisors (see below), whose sum is σ = 43524000. Its totient is φ = 9833472.

The previous prime is 21055763. The next prime is 21055799. The reversal of 21055792 is 29755012.

It is not an unprimeable number, because it can be changed into a prime (21055799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53934 + ... + 54322.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^21055792 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 21055792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21762000).

21055792 is an abundant number, since it is smaller than the sum of its proper divisors (22468208).

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

21055792 is a wasteful number, since it uses less digits than its factorization.

21055792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 21055792 is about 4588.6590633866. The cubic root of 21055792 is about 276.1365284058.

The spelling of 21055792 in words is "twenty-one million, fifty-five thousand, seven hundred ninety-two".