21414205 has 16 divisors (see below), whose sum is σ = 26389440. Its totient is φ = 16676352.

The previous prime is 21414193. The next prime is 21414221. The reversal of 21414205 is 50241412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21414205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32166 + ... + 32824.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^21414205 is an apocalyptic number.

It is an amenable number.

21414205 is a deficient number, since it is larger than the sum of its proper divisors (4975235).

21414205 is an equidigital number, since it uses as much as digits as its factorization.

21414205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21414205 is about 4627.5484870501. The cubic root of 21414205 is about 277.6945258365.

Adding to 21414205 its reverse (50241412), we get a palindrome (71655617).

The spelling of 21414205 in words is "twenty-one million, four hundred fourteen thousand, two hundred five".