21419685 has 48 divisors (see below), whose sum is σ = 43265664. Its totient is φ = 9599616.

The previous prime is 21419681. The next prime is 21419701. The reversal of 21419685 is 58691412.

It is not a de Polignac number, because 21419685 - 2² = 21419681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419681) 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 47 ways as a sum of consecutive naturals, for example, 16054 + ... + 17336.

It is an arithmetic number, because the mean of its divisors is an integer number (901368).

Almost surely, 2^21419685 is an apocalyptic number.

It is an amenable number.

21419685 is an abundant number, since it is smaller than the sum of its proper divisors (21845979).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21419685 is a wasteful number, since it uses less digits than its factorization.

21419685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1351 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 21419685 is about 4628.1405553419. The cubic root of 21419685 is about 277.7182116128.

The spelling of 21419685 in words is "twenty-one million, four hundred nineteen thousand, six hundred eighty-five".