21310044 has 48 divisors (see below), whose sum is σ = 60173568. Its totient is φ = 5730048.

The previous prime is 21310043. The next prime is 21310049. The reversal of 21310044 is 44001312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6034 + ... + 8889.

It is an arithmetic number, because the mean of its divisors is an integer number (1253616).

Almost surely, 2^21310044 is an apocalyptic number.

It is an amenable number.

21310044 is an abundant number, since it is smaller than the sum of its proper divisors (38863524).

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

21310044 is a wasteful number, since it uses less digits than its factorization.

21310044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14954 (or 14952 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21310044 is about 4616.2803207778. The cubic root of 21310044 is about 277.2435484805.

Adding to 21310044 its reverse (44001312), we get a palindrome (65311356).

The spelling of 21310044 in words is "twenty-one million, three hundred ten thousand, forty-four".