21052822 has 16 divisors (see below), whose sum is σ = 36168192. Its totient is φ = 9003240.

The previous prime is 21052771. The next prime is 21052841. The reversal of 21052822 is 22825012.

It is a junction number, because it is equal to n+sod(n) for n = 21052793 and 21052802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6547 + ... + 9217.

It is an arithmetic number, because the mean of its divisors is an integer number (2260512).

Almost surely, 2^21052822 is an apocalyptic number.

21052822 is a deficient number, since it is larger than the sum of its proper divisors (15115370).

21052822 is a wasteful number, since it uses less digits than its factorization.

21052822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21052822 is about 4588.3354280174. The cubic root of 21052822 is about 276.1235444242.

Adding to 21052822 its reverse (22825012), we get a palindrome (43877834).

The spelling of 21052822 in words is "twenty-one million, fifty-two thousand, eight hundred twenty-two".