21485769 has 8 divisors (see below), whose sum is σ = 28700832. Its totient is φ = 14297280.

The previous prime is 21485747. The next prime is 21485771. The reversal of 21485769 is 96758412.

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

It is not a de Polignac number, because 21485769 - 2¹² = 21481673 is a prime.

It is a super-2 number, since 2×21485769² = 923276539042722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21485769.

It is not an unprimeable number, because it can be changed into a prime (21485729) 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 7 ways as a sum of consecutive naturals, for example, 4672 + ... + 8049.

It is an arithmetic number, because the mean of its divisors is an integer number (3587604).

Almost surely, 2^21485769 is an apocalyptic number.

It is an amenable number.

21485769 is a deficient number, since it is larger than the sum of its proper divisors (7215063).

21485769 is a wasteful number, since it uses less digits than its factorization.

21485769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13287.

The product of its digits is 120960, while the sum is 42.

The square root of 21485769 is about 4635.2744255330. The cubic root of 21485769 is about 278.0035237550.

The spelling of 21485769 in words is "twenty-one million, four hundred eighty-five thousand, seven hundred sixty-nine".