21248701 has 4 divisors (see below), whose sum is σ = 21767004. Its totient is φ = 20730400.

The previous prime is 21248699. The next prime is 21248713. The reversal of 21248701 is 10784212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9449476 + 11799225 = 3074^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 21248701 - 2¹ = 21248699 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 (21248771) 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 3 ways as a sum of consecutive naturals, for example, 259090 + ... + 259171.

It is an arithmetic number, because the mean of its divisors is an integer number (5441751).

Almost surely, 2^21248701 is an apocalyptic number.

It is an amenable number.

21248701 is a deficient number, since it is larger than the sum of its proper divisors (518303).

21248701 is an equidigital number, since it uses as much as digits as its factorization.

21248701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518302.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21248701 is about 4609.6313301608. The cubic root of 21248701 is about 276.9772687885.

The spelling of 21248701 in words is "twenty-one million, two hundred forty-eight thousand, seven hundred one".