21310444 has 12 divisors (see below), whose sum is σ = 37624104. Its totient is φ = 10560704.

The previous prime is 21310439. The next prime is 21310451. The reversal of 21310444 is 44401312.

It is an unprimeable number.

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, 23122 + ... + 24025.

It is an arithmetic number, because the mean of its divisors is an integer number (3135342).

Almost surely, 2^21310444 is an apocalyptic number.

It is an amenable number.

21310444 is a deficient number, since it is larger than the sum of its proper divisors (16313660).

21310444 is a wasteful number, since it uses less digits than its factorization.

21310444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47264 (or 47262 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21310444 is about 4616.3236454997. The cubic root of 21310444 is about 277.2452831355.

Adding to 21310444 its reverse (44401312), we get a palindrome (65711756).

The spelling of 21310444 in words is "twenty-one million, three hundred ten thousand, four hundred forty-four".