21488069 has 4 divisors (see below), whose sum is σ = 22619040. Its totient is φ = 20357100.

The previous prime is 21488063. The next prime is 21488087. The reversal of 21488069 is 96088412.

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 21488069 - 2²⁰ = 20439493 is a prime.

It is a super-2 number, since 2×21488069² = 923474218697522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565457 + ... + 565494.

It is an arithmetic number, because the mean of its divisors is an integer number (5654760).

Almost surely, 2^21488069 is an apocalyptic number.

It is an amenable number.

21488069 is a deficient number, since it is larger than the sum of its proper divisors (1130971).

21488069 is a wasteful number, since it uses less digits than its factorization.

21488069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130970.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21488069 is about 4635.5225163945. The cubic root of 21488069 is about 278.0134432710.

The spelling of 21488069 in words is "twenty-one million, four hundred eighty-eight thousand, sixty-nine".