21485679 has 8 divisors (see below), whose sum is σ = 28694832. Its totient is φ = 14300160.

The previous prime is 21485677. The next prime is 21485687. The reversal of 21485679 is 97658412.

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

It is not a de Polignac number, because 21485679 - 2¹ = 21485677 is a prime.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21485679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3664 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (3586854).

Almost surely, 2^21485679 is an apocalyptic number.

21485679 is a deficient number, since it is larger than the sum of its proper divisors (7209153).

21485679 is a wasteful number, since it uses less digits than its factorization.

21485679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11817.

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

The square root of 21485679 is about 4635.2647173597. The cubic root of 21485679 is about 278.0031355856.

The spelling of 21485679 in words is "twenty-one million, four hundred eighty-five thousand, six hundred seventy-nine".