21485398 has 16 divisors (see below), whose sum is σ = 35251344. Its totient is φ = 9740160.

The previous prime is 21485357. The next prime is 21485413. The reversal of 21485398 is 89358412.

It is a self number, because there is not a number n which added to its sum of digits gives 21485398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8986 + ... + 11122.

It is an arithmetic number, because the mean of its divisors is an integer number (2203209).

Almost surely, 2^21485398 is an apocalyptic number.

21485398 is a deficient number, since it is larger than the sum of its proper divisors (13765946).

21485398 is a wasteful number, since it uses less digits than its factorization.

21485398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607.

The product of its digits is 69120, while the sum is 40.

The square root of 21485398 is about 4635.2344061547. The cubic root of 21485398 is about 278.0019236276.

The spelling of 21485398 in words is "twenty-one million, four hundred eighty-five thousand, three hundred ninety-eight".