21414643 has 4 divisors (see below), whose sum is σ = 21551200. Its totient is φ = 21278088.

The previous prime is 21414641. The next prime is 21414649. The reversal of 21414643 is 34641412.

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 21414643 - 2¹ = 21414641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414641) 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, 68043 + ... + 68356.

It is an arithmetic number, because the mean of its divisors is an integer number (5387800).

Almost surely, 2^21414643 is an apocalyptic number.

21414643 is a deficient number, since it is larger than the sum of its proper divisors (136557).

21414643 is a wasteful number, since it uses less digits than its factorization.

21414643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136556.

The product of its digits is 2304, while the sum is 25.

The square root of 21414643 is about 4627.5958120821. The cubic root of 21414643 is about 277.6964191183.

The spelling of 21414643 in words is "twenty-one million, four hundred fourteen thousand, six hundred forty-three".