21451214 has 8 divisors (see below), whose sum is σ = 32196528. Its totient is φ = 10719040.

The previous prime is 21451207. The next prime is 21451217. The reversal of 21451214 is 41215412.

It is a happy number.

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 (21451217) 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, 4319 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (4024566).

Almost surely, 2^21451214 is an apocalyptic number.

21451214 is a deficient number, since it is larger than the sum of its proper divisors (10745314).

21451214 is a wasteful number, since it uses less digits than its factorization.

21451214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6570.

The product of its digits is 320, while the sum is 20.

The square root of 21451214 is about 4631.5455303818. The cubic root of 21451214 is about 277.8544085231.

Adding to 21451214 its reverse (41215412), we get a palindrome (62666626).

The spelling of 21451214 in words is "twenty-one million, four hundred fifty-one thousand, two hundred fourteen".