21668362 has 4 divisors (see below), whose sum is σ = 32502546. Its totient is φ = 10834180.

The previous prime is 21668327. The next prime is 21668389. The reversal of 21668362 is 26386612.

It is a happy number.

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., 21353641 + 314721 = 4621^2 + 561^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5417089 + ... + 5417092.

Almost surely, 2^21668362 is an apocalyptic number.

21668362 is a deficient number, since it is larger than the sum of its proper divisors (10834184).

21668362 is a wasteful number, since it uses less digits than its factorization.

21668362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10834183.

The product of its digits is 20736, while the sum is 34.

The square root of 21668362 is about 4654.9287857066. The cubic root of 21668362 is about 278.7888245841.

The spelling of 21668362 in words is "twenty-one million, six hundred sixty-eight thousand, three hundred sixty-two".