21412811 has 16 divisors (see below), whose sum is σ = 25132800. Its totient is φ = 17864928.

The previous prime is 21412801. The next prime is 21412823. The reversal of 21412811 is 11821412.

It is a cyclic number.

It is not a de Polignac number, because 21412811 - 2¹⁰ = 21411787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21412801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57221 + ... + 57593.

It is an arithmetic number, because the mean of its divisors is an integer number (1570800).

Almost surely, 2^21412811 is an apocalyptic number.

21412811 is a deficient number, since it is larger than the sum of its proper divisors (3719989).

21412811 is a wasteful number, since it uses less digits than its factorization.

21412811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578.

The product of its digits is 128, while the sum is 20.

The square root of 21412811 is about 4627.3978648912. The cubic root of 21412811 is about 277.6885000144.

The spelling of 21412811 in words is "twenty-one million, four hundred twelve thousand, eight hundred eleven".