21046100 has 18 divisors (see below), whose sum is σ = 45670254. Its totient is φ = 8418400.

The previous prime is 21046073. The next prime is 21046111. The reversal of 21046100 is 164012.

It can be written as a sum of positive squares in 3 ways, for example, as 234256 + 20811844 = 484^2 + 4562^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105131 + ... + 105330.

Almost surely, 2^21046100 is an apocalyptic number.

21046100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21046100 is an abundant number, since it is smaller than the sum of its proper divisors (24624154).

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

21046100 is a wasteful number, since it uses less digits than its factorization.

21046100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210475 (or 210468 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21046100 is about 4587.6028598823. The cubic root of 21046100 is about 276.0941532726.

The spelling of 21046100 in words is "twenty-one million, forty-six thousand, one hundred".