21148301 has 4 divisors (see below), whose sum is σ = 21157500. Its totient is φ = 21139104.

The previous prime is 21148297. The next prime is 21148321. The reversal of 21148301 is 10384112.

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 18748900 + 2399401 = 4330^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 21148301 - 2² = 21148297 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148321) 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, 2225 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (5289375).

Almost surely, 2^21148301 is an apocalyptic number.

It is an amenable number.

21148301 is a deficient number, since it is larger than the sum of its proper divisors (9199).

21148301 is an equidigital number, since it uses as much as digits as its factorization.

21148301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21148301 is about 4598.7281937510. The cubic root of 21148301 is about 276.5403411933.

The spelling of 21148301 in words is "twenty-one million, one hundred forty-eight thousand, three hundred one".