21048837 has 4 divisors (see below), whose sum is σ = 28065120. Its totient is φ = 14032556.

The previous prime is 21048829. The next prime is 21048857. The reversal of 21048837 is 73884012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21048837 - 2³ = 21048829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21048798 and 21048807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21048857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3508137 + ... + 3508142.

It is an arithmetic number, because the mean of its divisors is an integer number (7016280).

Almost surely, 2^21048837 is an apocalyptic number.

It is an amenable number.

21048837 is a deficient number, since it is larger than the sum of its proper divisors (7016283).

21048837 is an equidigital number, since it uses as much as digits as its factorization.

21048837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016282.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21048837 is about 4587.9011541227. The cubic root of 21048837 is about 276.1061212372.

The spelling of 21048837 in words is "twenty-one million, forty-eight thousand, eight hundred thirty-seven".