21244414 has 16 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 10060960.

The previous prime is 21244369. The next prime is 21244417. The reversal of 21244414 is 41444212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244417) 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 7 ways as a sum of consecutive naturals, for example, 382 + ... + 6529.

It is an arithmetic number, because the mean of its divisors is an integer number (2099520).

Almost surely, 2^21244414 is an apocalyptic number.

21244414 is a deficient number, since it is larger than the sum of its proper divisors (12347906).

21244414 is a wasteful number, since it uses less digits than its factorization.

21244414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995.

The product of its digits is 1024, while the sum is 22.

The square root of 21244414 is about 4609.1663020551. The cubic root of 21244414 is about 276.9586404904.

Adding to 21244414 its reverse (41444212), we get a palindrome (62688626).

The spelling of 21244414 in words is "twenty-one million, two hundred forty-four thousand, four hundred fourteen".