21448761 has 8 divisors (see below), whose sum is σ = 28817184. Its totient is φ = 14189760.

The previous prime is 21448723. The next prime is 21448793. The reversal of 21448761 is 16784412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21448761 - 2¹⁷ = 21317689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21448711) 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 7 ways as a sum of consecutive naturals, for example, 26896 + ... + 27681.

It is an arithmetic number, because the mean of its divisors is an integer number (3602148).

Almost surely, 2^21448761 is an apocalyptic number.

It is an amenable number.

21448761 is a deficient number, since it is larger than the sum of its proper divisors (7368423).

21448761 is a wasteful number, since it uses less digits than its factorization.

21448761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54711.

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

The square root of 21448761 is about 4631.2807084002. The cubic root of 21448761 is about 277.8438170037.

The spelling of 21448761 in words is "twenty-one million, four hundred forty-eight thousand, seven hundred sixty-one".