21313230653 has 16 divisors (see below), whose sum is σ = 25073145216. Its totient is φ = 17861067840.

The previous prime is 21313230649. The next prime is 21313230683. The reversal of 21313230653 is 35603231312.

It is not a de Polignac number, because 21313230653 - 2² = 21313230649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313230683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5951 + ... + 206547.

It is an arithmetic number, because the mean of its divisors is an integer number (1567071576).

Almost surely, 2^21313230653 is an apocalyptic number.

It is an amenable number.

21313230653 is a deficient number, since it is larger than the sum of its proper divisors (3759914563).

21313230653 is a wasteful number, since it uses less digits than its factorization.

21313230653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201364.

The product of its (nonzero) digits is 9720, while the sum is 29.

Adding to 21313230653 its reverse (35603231312), we get a palindrome (56916461965).

The spelling of 21313230653 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty thousand, six hundred fifty-three".