21308362 has 4 divisors (see below), whose sum is σ = 31962546. Its totient is φ = 10654180.

The previous prime is 21308351. The next prime is 21308369. The reversal of 21308362 is 26380312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16818201 + 4490161 = 4101^2 + 2119^2 .

It is a super-2 number, since 2×21308362² = 908092582246088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21308369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327089 + ... + 5327092.

Almost surely, 2^21308362 is an apocalyptic number.

21308362 is a deficient number, since it is larger than the sum of its proper divisors (10654184).

21308362 is a wasteful number, since it uses less digits than its factorization.

21308362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10654183.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21308362 is about 4616.0981358719. The cubic root of 21308362 is about 277.2362540185.

Adding to 21308362 its reverse (26380312), we get a palindrome (47688674).

The spelling of 21308362 in words is "twenty-one million, three hundred eight thousand, three hundred sixty-two".