21099466 has 8 divisors (see below), whose sum is σ = 31672260. Its totient is φ = 10542048.

The previous prime is 21099451. The next prime is 21099467. The reversal of 21099466 is 66499012.

It can be written as a sum of positive squares in 2 ways, for example, as 15832441 + 5267025 = 3979^2 + 2295^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21099467) 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, 630 + ... + 6526.

Almost surely, 2^21099466 is an apocalyptic number.

21099466 is a deficient number, since it is larger than the sum of its proper divisors (10572794).

21099466 is a wasteful number, since it uses less digits than its factorization.

21099466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7688.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 21099466 is about 4593.4155048286. The cubic root of 21099466 is about 276.3273176836.

The spelling of 21099466 in words is "twenty-one million, ninety-nine thousand, four hundred sixty-six".