21048445 has 16 divisors (see below), whose sum is σ = 27815040. Its totient is φ = 15163200.

The previous prime is 21048421. The next prime is 21048451. The reversal of 21048445 is 54484012.

It is not a de Polignac number, because 21048445 - 2⁵ = 21048413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4240 + ... + 7750.

It is an arithmetic number, because the mean of its divisors is an integer number (1738440).

Almost surely, 2^21048445 is an apocalyptic number.

It is an amenable number.

21048445 is a deficient number, since it is larger than the sum of its proper divisors (6766595).

21048445 is a wasteful number, since it uses less digits than its factorization.

21048445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 21048445 is about 4587.8584328639. The cubic root of 21048445 is about 276.1044072190.

The spelling of 21048445 in words is "twenty-one million, forty-eight thousand, four hundred forty-five".