21048105 has 72 divisors (see below), whose sum is σ = 40160448. Its totient is φ = 9389952.

The previous prime is 21048103. The next prime is 21048109. The reversal of 21048105 is 50184012.

It is not a de Polignac number, because 21048105 - 2¹ = 21048103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21048103) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 915124 + ... + 915146.

It is an arithmetic number, because the mean of its divisors is an integer number (557784).

Almost surely, 2^21048105 is an apocalyptic number.

It is an amenable number.

21048105 is a deficient number, since it is larger than the sum of its proper divisors (19112343).

21048105 is a wasteful number, since it uses less digits than its factorization.

21048105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21048105 is about 4587.8213783887. The cubic root of 21048105 is about 276.1029205533.

The spelling of 21048105 in words is "twenty-one million, forty-eight thousand, one hundred five".