21460245 has 8 divisors (see below), whose sum is σ = 34336416. Its totient is φ = 11445456.

The previous prime is 21460237. The next prime is 21460331. The reversal of 21460245 is 54206412.

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

It is not a de Polignac number, because 21460245 - 2³ = 21460237 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 715327 + ... + 715356.

It is an arithmetic number, because the mean of its divisors is an integer number (4292052).

Almost surely, 2^21460245 is an apocalyptic number.

It is an amenable number.

21460245 is a deficient number, since it is larger than the sum of its proper divisors (12876171).

21460245 is a wasteful number, since it uses less digits than its factorization.

21460245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430691.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21460245 is about 4632.5203723243. The cubic root of 21460245 is about 277.8933954557.

Adding to 21460245 its reverse (54206412), we get a palindrome (75666657).

The spelling of 21460245 in words is "twenty-one million, four hundred sixty thousand, two hundred forty-five".