21470444 has 12 divisors (see below), whose sum is σ = 37607304. Its totient is φ = 10725504.

The previous prime is 21470443. The next prime is 21470461. The reversal of 21470444 is 44407412.

It is a super-3 number, since 3×21470444³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21470441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5207 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (3133942).

Almost surely, 2^21470444 is an apocalyptic number.

It is an amenable number.

21470444 is a deficient number, since it is larger than the sum of its proper divisors (16136860).

21470444 is a wasteful number, since it uses less digits than its factorization.

21470444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864 (or 4862 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 21470444 is about 4633.6210462229. The cubic root of 21470444 is about 277.9374115091.

Adding to 21470444 its reverse (44407412), we get a palindrome (65877856).

The spelling of 21470444 in words is "twenty-one million, four hundred seventy thousand, four hundred forty-four".