21301169 has 4 divisors (see below), whose sum is σ = 21311844. Its totient is φ = 21290496.

The previous prime is 21301157. The next prime is 21301193. The reversal of 21301169 is 96110312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13104400 + 8196769 = 3620^2 + 2863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301169 is a prime.

It is a super-2 number, since 2×21301169² = 907479601533122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301069) 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 3 ways as a sum of consecutive naturals, for example, 1352 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (5327961).

Almost surely, 2^21301169 is an apocalyptic number.

It is an amenable number.

21301169 is a deficient number, since it is larger than the sum of its proper divisors (10675).

21301169 is an equidigital number, since it uses as much as digits as its factorization.

21301169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10674.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 21301169 is about 4615.3189488918. The cubic root of 21301169 is about 277.2050552367.

The spelling of 21301169 in words is "twenty-one million, three hundred one thousand, one hundred sixty-nine".