21010610 has 8 divisors (see below), whose sum is σ = 37819116. Its totient is φ = 8404240.

The previous prime is 21010609. The next prime is 21010663. The reversal of 21010610 is 1601012.

It can be written as a sum of positive squares in 2 ways, for example, as 17297281 + 3713329 = 4159^2 + 1927^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21010591 and 21010600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050521 + ... + 1050540.

Almost surely, 2^21010610 is an apocalyptic number.

21010610 is a deficient number, since it is larger than the sum of its proper divisors (16808506).

21010610 is a wasteful number, since it uses less digits than its factorization.

21010610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101068.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21010610 is about 4583.7331946788. The cubic root of 21010610 is about 275.9388736017.

Adding to 21010610 its reverse (1601012), we get a palindrome (22611622).

The spelling of 21010610 in words is "twenty-one million, ten thousand, six hundred ten".