21008010 has 32 divisors (see below), whose sum is σ = 50605632. Its totient is φ = 5581440.

The previous prime is 21007999. The next prime is 21008011. The reversal of 21008010 is 1080012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21008011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8070 + ... + 10350.

It is an arithmetic number, because the mean of its divisors is an integer number (1581426).

Almost surely, 2^21008010 is an apocalyptic number.

21008010 is an abundant number, since it is smaller than the sum of its proper divisors (29597622).

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

21008010 is a wasteful number, since it uses less digits than its factorization.

21008010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21008010 is about 4583.4495742835. The cubic root of 21008010 is about 275.9274909294.

Adding to 21008010 its reverse (1080012), we get a palindrome (22088022).

The spelling of 21008010 in words is "twenty-one million, eight thousand, ten".