21444030 has 24 divisors (see below), whose sum is σ = 55754712. Its totient is φ = 5718384.

The previous prime is 21444023. The next prime is 21444043. The reversal of 21444030 is 3044412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21443994 and 21444012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119044 + ... + 119223.

It is an arithmetic number, because the mean of its divisors is an integer number (2323113).

Almost surely, 2^21444030 is an apocalyptic number.

21444030 is an abundant number, since it is smaller than the sum of its proper divisors (34310682).

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

21444030 is a wasteful number, since it uses less digits than its factorization.

21444030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238280 (or 238277 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21444030 is about 4630.7699143879. The cubic root of 21444030 is about 277.8233872960.

Adding to 21444030 its reverse (3044412), we get a palindrome (24488442).

It can be divided in two parts, 214 and 44030, that added together give a palindrome (44244).

The spelling of 21444030 in words is "twenty-one million, four hundred forty-four thousand, thirty".