21048769 has 4 divisors (see below), whose sum is σ = 24055744. Its totient is φ = 18041796.

The previous prime is 21048761. The next prime is 21048793. The reversal of 21048769 is 96784012.

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 21048769 - 2³ = 21048761 is a prime.

It is a super-2 number, since 2×21048769² = 886101352830722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048761) 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, 1503477 + ... + 1503490.

It is an arithmetic number, because the mean of its divisors is an integer number (6013936).

Almost surely, 2^21048769 is an apocalyptic number.

It is an amenable number.

21048769 is a deficient number, since it is larger than the sum of its proper divisors (3006975).

21048769 is an equidigital number, since it uses as much as digits as its factorization.

21048769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006974.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21048769 is about 4587.8937433206. The cubic root of 21048769 is about 276.1058239091.

The spelling of 21048769 in words is "twenty-one million, forty-eight thousand, seven hundred sixty-nine".