21048907 has 16 divisors (see below), whose sum is σ = 25104384. Its totient is φ = 17424000.

The previous prime is 21048901. The next prime is 21048913. The reversal of 21048907 is 70984012.

It is an interprime number because it is at equal distance from previous prime (21048901) and next prime (21048913).

It is not a de Polignac number, because 21048907 - 2¹¹ = 21046859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3982 + ... + 7612.

It is an arithmetic number, because the mean of its divisors is an integer number (1569024).

Almost surely, 2^21048907 is an apocalyptic number.

21048907 is a deficient number, since it is larger than the sum of its proper divisors (4055477).

21048907 is a wasteful number, since it uses less digits than its factorization.

21048907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21048907 is about 4587.9087828770. The cubic root of 21048907 is about 276.1064273097.

It can be divided in two parts, 2104 and 8907, that added together give a palindrome (11011).

The spelling of 21048907 in words is "twenty-one million, forty-eight thousand, nine hundred seven".