21414330 has 96 divisors (see below), whose sum is σ = 67017600. Its totient is φ = 4634496.

The previous prime is 21414313. The next prime is 21414361. The reversal of 21414330 is 3341412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11076 + ... + 12864.

It is an arithmetic number, because the mean of its divisors is an integer number (698100).

Almost surely, 2^21414330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21414330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33508800).

21414330 is an abundant number, since it is smaller than the sum of its proper divisors (45603270).

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

21414330 is a wasteful number, since it uses less digits than its factorization.

21414330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21414330 is about 4627.5619931018. The cubic root of 21414330 is about 277.6950661593.

Adding to 21414330 its reverse (3341412), we get a palindrome (24755742).

The spelling of 21414330 in words is "twenty-one million, four hundred fourteen thousand, three hundred thirty".