21019106 has 16 divisors (see below), whose sum is σ = 33885216. Its totient is φ = 9742656.

The previous prime is 21019069. The next prime is 21019127. The reversal of 21019106 is 60191012.

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 7 ways as a sum of consecutive naturals, for example, 2336 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (2117826).

Almost surely, 2^21019106 is an apocalyptic number.

21019106 is a deficient number, since it is larger than the sum of its proper divisors (12866110).

21019106 is a wasteful number, since it uses less digits than its factorization.

21019106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9313.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 21019106 is about 4584.6598565215. The cubic root of 21019106 is about 275.9760621261.

The spelling of 21019106 in words is "twenty-one million, nineteen thousand, one hundred six".