21411830 has 16 divisors (see below), whose sum is σ = 42045264. Its totient is φ = 7786080.

The previous prime is 21411811. The next prime is 21411833. The reversal of 21411830 is 3811412.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411833) 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, 97217 + ... + 97436.

It is an arithmetic number, because the mean of its divisors is an integer number (2627829).

Almost surely, 2^21411830 is an apocalyptic number.

21411830 is a deficient number, since it is larger than the sum of its proper divisors (20633434).

21411830 is a wasteful number, since it uses less digits than its factorization.

21411830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194671.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21411830 is about 4627.2918645791. The cubic root of 21411830 is about 277.6842593042.

The spelling of 21411830 in words is "twenty-one million, four hundred eleven thousand, eight hundred thirty".