21337066 has 4 divisors (see below), whose sum is σ = 32005602. Its totient is φ = 10668532.

The previous prime is 21337061. The next prime is 21337081. The reversal of 21337066 is 66073312.

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., 11758041 + 9579025 = 3429^2 + 3095^2 .

It is not an unprimeable number, because it can be changed into a prime (21337061) 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 as a sum of consecutive naturals, namely, 5334265 + ... + 5334268.

Almost surely, 2^21337066 is an apocalyptic number.

21337066 is a deficient number, since it is larger than the sum of its proper divisors (10668536).

21337066 is a wasteful number, since it uses less digits than its factorization.

21337066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668535.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21337066 is about 4619.2062088632. The cubic root of 21337066 is about 277.3606843377.

The spelling of 21337066 in words is "twenty-one million, three hundred thirty-seven thousand, sixty-six".