21313004 has 6 divisors (see below), whose sum is σ = 37297764. Its totient is φ = 10656500.

The previous prime is 21313001. The next prime is 21313021. The reversal of 21313004 is 40031312.

It is a self number, because there is not a number n which added to its sum of digits gives 21313004.

It is not an unprimeable number, because it can be changed into a prime (21313001) by changing a digit.

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 as a sum of consecutive naturals, namely, 2664122 + ... + 2664129.

It is an arithmetic number, because the mean of its divisors is an integer number (6216294).

Almost surely, 2^21313004 is an apocalyptic number.

It is an amenable number.

21313004 is a deficient number, since it is larger than the sum of its proper divisors (15984760).

21313004 is a wasteful number, since it uses less digits than its factorization.

21313004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328255 (or 5328253 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21313004 is about 4616.6009140925. The cubic root of 21313004 is about 277.2563844138.

Adding to 21313004 its reverse (40031312), we get a palindrome (61344316).

The spelling of 21313004 in words is "twenty-one million, three hundred thirteen thousand, four".