21685002 has 16 divisors (see below), whose sum is σ = 43792320. Its totient is φ = 7157952.

The previous prime is 21684989. The next prime is 21685007. The reversal of 21685002 is 20058612.

It is not an unprimeable number, because it can be changed into a prime (21685007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16927 + ... + 18162.

It is an arithmetic number, because the mean of its divisors is an integer number (2737020).

Almost surely, 2^21685002 is an apocalyptic number.

21685002 is an abundant number, since it is smaller than the sum of its proper divisors (22107318).

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

21685002 is a wasteful number, since it uses less digits than its factorization.

21685002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35197.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21685002 is about 4656.7157954936. The cubic root of 21685002 is about 278.8601706792.

The spelling of 21685002 in words is "twenty-one million, six hundred eighty-five thousand, two".