21164299 has 8 divisors (see below), whose sum is σ = 23322992. Its totient is φ = 19081440.

The previous prime is 21164293. The next prime is 21164321. The reversal of 21164299 is 99246112.

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 21164299 - 2³ = 21164291 is a prime.

It is a super-2 number, since 2×21164299² = 895855104322802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164291) 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, 18372 + ... + 19489.

It is an arithmetic number, because the mean of its divisors is an integer number (2915374).

Almost surely, 2^21164299 is an apocalyptic number.

21164299 is a deficient number, since it is larger than the sum of its proper divisors (2158693).

21164299 is a wasteful number, since it uses less digits than its factorization.

21164299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37917.

The product of its digits is 7776, while the sum is 34.

The square root of 21164299 is about 4600.4672588771. The cubic root of 21164299 is about 276.6100548674.

The spelling of 21164299 in words is "twenty-one million, one hundred sixty-four thousand, two hundred ninety-nine".