21821362 has 4 divisors (see below), whose sum is σ = 32732046. Its totient is φ = 10910680.

The previous prime is 21821351. The next prime is 21821363. The reversal of 21821362 is 26312812.

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., 13242321 + 8579041 = 3639^2 + 2929^2 .

It is not an unprimeable number, because it can be changed into a prime (21821363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5455339 + ... + 5455342.

Almost surely, 2^21821362 is an apocalyptic number.

21821362 is a deficient number, since it is larger than the sum of its proper divisors (10910684).

21821362 is a wasteful number, since it uses less digits than its factorization.

21821362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910683.

The product of its digits is 1152, while the sum is 25.

The square root of 21821362 is about 4671.3340706912. The cubic root of 21821362 is about 279.4434608601.

The spelling of 21821362 in words is "twenty-one million, eight hundred twenty-one thousand, three hundred sixty-two".