21414811 has 4 divisors (see below), whose sum is σ = 23361624. Its totient is φ = 19468000.

The previous prime is 21414803. The next prime is 21414853. The reversal of 21414811 is 11841412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21414811 - 2³ = 21414803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21414871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973390 + ... + 973411.

It is an arithmetic number, because the mean of its divisors is an integer number (5840406).

Almost surely, 2^21414811 is an apocalyptic number.

21414811 is a deficient number, since it is larger than the sum of its proper divisors (1946813).

21414811 is a wasteful number, since it uses less digits than its factorization.

21414811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946812.

The product of its digits is 256, while the sum is 22.

The square root of 21414811 is about 4627.6139640208. The cubic root of 21414811 is about 277.6971453017.

The spelling of 21414811 in words is "twenty-one million, four hundred fourteen thousand, eight hundred eleven".