21010106 has 8 divisors (see below), whose sum is σ = 33939444. Its totient is φ = 9696960.

The previous prime is 21010097. The next prime is 21010111. The reversal of 21010106 is 60101012.

It can be written as a sum of positive squares in 2 ways, for example, as 20784481 + 225625 = 4559^2 + 475^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 404015 + ... + 404066.

Almost surely, 2^21010106 is an apocalyptic number.

21010106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21010106 is a deficient number, since it is larger than the sum of its proper divisors (12929338).

21010106 is a wasteful number, since it uses less digits than its factorization.

21010106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808096.

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

The square root of 21010106 is about 4583.6782173272. The cubic root of 21010106 is about 275.9366671879.

Adding to 21010106 its reverse (60101012), we get a palindrome (81111118).

The spelling of 21010106 in words is "twenty-one million, ten thousand, one hundred six".