21051322 has 8 divisors (see below), whose sum is σ = 31657716. Its totient is φ = 10498752.

The previous prime is 21051311. The next prime is 21051323. The reversal of 21051322 is 22315012.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 175561 = 4569^2 + 419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21051296 and 21051305.

It is not an unprimeable number, because it can be changed into a prime (21051323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12463 + ... + 14050.

Almost surely, 2^21051322 is an apocalyptic number.

21051322 is a deficient number, since it is larger than the sum of its proper divisors (10606394).

21051322 is a wasteful number, since it uses less digits than its factorization.

21051322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26912.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21051322 is about 4588.1719671346. The cubic root of 21051322 is about 276.1169863935.

Adding to 21051322 its reverse (22315012), we get a palindrome (43366334).

The spelling of 21051322 in words is "twenty-one million, fifty-one thousand, three hundred twenty-two".