21068099 has 8 divisors (see below), whose sum is σ = 22757952. Its totient is φ = 19388160.

The previous prime is 21068087. The next prime is 21068101. The reversal of 21068099 is 99086012.

It is a Cunningham number, because it is equal to 4590²-1.

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

It is a cyclic number.

It is not a de Polignac number, because 21068099 - 2⁸ = 21067843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21068039) 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 in 7 ways as a sum of consecutive naturals, for example, 2294 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (2844744).

Almost surely, 2^21068099 is an apocalyptic number.

21068099 is a deficient number, since it is larger than the sum of its proper divisors (1689853).

21068099 is a wasteful number, since it uses less digits than its factorization.

21068099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4957.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 21068099 is about 4589.9998910675. Note that the first 3 decimals coincide. The cubic root of 21068099 is about 276.1903180448.

The spelling of 21068099 in words is "twenty-one million, sixty-eight thousand, ninety-nine".