21414450 has 48 divisors (see below), whose sum is σ = 53389440. Its totient is φ = 5680320.

The previous prime is 21414431. The next prime is 21414457. The reversal of 21414450 is 5441412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21414457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54856 + ... + 55244.

It is an arithmetic number, because the mean of its divisors is an integer number (1112280).

Almost surely, 2^21414450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21414450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26694720).

21414450 is an abundant number, since it is smaller than the sum of its proper divisors (31974990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21414450 is a wasteful number, since it uses less digits than its factorization.

21414450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 21414450 is about 4627.5749588742. The cubic root of 21414450 is about 277.6955848672.

Adding to 21414450 its reverse (5441412), we get a palindrome (26855862).

The spelling of 21414450 in words is "twenty-one million, four hundred fourteen thousand, four hundred fifty".