21414415 has 16 divisors (see below), whose sum is σ = 28377216. Its totient is φ = 15383200.

The previous prime is 21414413. The next prime is 21414427. The reversal of 21414415 is 51441412.

It is not a de Polignac number, because 21414415 - 2¹ = 21414413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2220 + ... + 6910.

It is an arithmetic number, because the mean of its divisors is an integer number (1773576).

Almost surely, 2^21414415 is an apocalyptic number.

21414415 is a deficient number, since it is larger than the sum of its proper divisors (6962801).

21414415 is a wasteful number, since it uses less digits than its factorization.

21414415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790.

The product of its digits is 640, while the sum is 22.

The square root of 21414415 is about 4627.5711771944. The cubic root of 21414415 is about 277.6954335776.

Adding to 21414415 its reverse (51441412), we get a palindrome (72855827).

It can be divided in two parts, 2141 and 4415, that added together give a palindrome (6556).

The spelling of 21414415 in words is "twenty-one million, four hundred fourteen thousand, four hundred fifteen".