21414441 has 16 divisors (see below), whose sum is σ = 31276800. Its totient is φ = 12972288.

The previous prime is 21414431. The next prime is 21414457. The reversal of 21414441 is 14441412.

It is not a de Polignac number, because 21414441 - 2⁵ = 21414409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21414401) 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, 5761 + ... + 8718.

It is an arithmetic number, because the mean of its divisors is an integer number (1954800).

Almost surely, 2^21414441 is an apocalyptic number.

It is an amenable number.

21414441 is a deficient number, since it is larger than the sum of its proper divisors (9862359).

21414441 is a wasteful number, since it uses less digits than its factorization.

21414441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14528.

The product of its digits is 512, while the sum is 21.

The square root of 21414441 is about 4627.5739864426. The cubic root of 21414441 is about 277.6955459641.

Adding to 21414441 its reverse (14441412), we get a palindrome (35855853).

It can be divided in two parts, 214144 and 41, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21414441 in words is "twenty-one million, four hundred fourteen thousand, four hundred forty-one".