21106146 has 16 divisors (see below), whose sum is σ = 44695584. Its totient is φ = 6621504.

The previous prime is 21106121. The next prime is 21106147. The reversal of 21106146 is 64160112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21106147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103360 + ... + 103563.

It is an arithmetic number, because the mean of its divisors is an integer number (2793474).

Almost surely, 2^21106146 is an apocalyptic number.

21106146 is an abundant number, since it is smaller than the sum of its proper divisors (23589438).

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

21106146 is a wasteful number, since it uses less digits than its factorization.

21106146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206945.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21106146 is about 4594.1425750623. The cubic root of 21106146 is about 276.3564759527.

Adding to 21106146 its reverse (64160112), we get a palindrome (85266258).

It can be divided in two parts, 2110 and 6146, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 21106146 in words is "twenty-one million, one hundred six thousand, one hundred forty-six".