21145414 has 8 divisors (see below), whose sum is σ = 31737888. Its totient is φ = 10566120.

The previous prime is 21145409. The next prime is 21145417. The reversal of 21145414 is 41454112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145417) 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 3 ways as a sum of consecutive naturals, for example, 3624 + ... + 7444.

It is an arithmetic number, because the mean of its divisors is an integer number (3967236).

Almost surely, 2^21145414 is an apocalyptic number.

21145414 is a deficient number, since it is larger than the sum of its proper divisors (10592474).

21145414 is a wasteful number, since it uses less digits than its factorization.

21145414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6590.

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

The square root of 21145414 is about 4598.4142919054. The cubic root of 21145414 is about 276.5277569153.

Adding to 21145414 its reverse (41454112), we get a palindrome (62599526).

The spelling of 21145414 in words is "twenty-one million, one hundred forty-five thousand, four hundred fourteen".