21288301 has 8 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 19965888.

The previous prime is 21288259. The next prime is 21288343. The reversal of 21288301 is 10388212.

It is an interprime number because it is at equal distance from previous prime (21288259) and next prime (21288343).

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

It is not a de Polignac number, because 21288301 - 2⁷ = 21288173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21288601) 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 7 ways as a sum of consecutive naturals, for example, 3180 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (2827440).

Almost surely, 2^21288301 is an apocalyptic number.

It is an amenable number.

21288301 is a deficient number, since it is larger than the sum of its proper divisors (1331219).

21288301 is a wasteful number, since it uses less digits than its factorization.

21288301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21288301 is about 4613.9246851244. The cubic root of 21288301 is about 277.1492242918.

The spelling of 21288301 in words is "twenty-one million, two hundred eighty-eight thousand, three hundred one".