21048245 has 8 divisors (see below), whose sum is σ = 25795584. Its totient is φ = 16480144.

The previous prime is 21048239. The next prime is 21048263. The reversal of 21048245 is 54284012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21048245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44549 + ... + 45018.

It is an arithmetic number, because the mean of its divisors is an integer number (3224448).

Almost surely, 2^21048245 is an apocalyptic number.

It is an amenable number.

21048245 is a deficient number, since it is larger than the sum of its proper divisors (4747339).

21048245 is an equidigital number, since it uses as much as digits as its factorization.

21048245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89619.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 21048245 is about 4587.8366361500. The cubic root of 21048245 is about 276.1035327117.

The spelling of 21048245 in words is "twenty-one million, forty-eight thousand, two hundred forty-five".