21320334245 has 16 divisors (see below), whose sum is σ = 30778227840. Its totient is φ = 13850201664.

The previous prime is 21320334241. The next prime is 21320334281. The reversal of 21320334245 is 54243302312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21320334245 - 2² = 21320334241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320334241) 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, 16029662 + ... + 16030991.

It is an arithmetic number, because the mean of its divisors is an integer number (1923639240).

Almost surely, 2^21320334245 is an apocalyptic number.

It is an amenable number.

21320334245 is a deficient number, since it is larger than the sum of its proper divisors (9457893595).

21320334245 is a wasteful number, since it uses less digits than its factorization.

21320334245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32060684.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21320334245 its reverse (54243302312), we get a palindrome (75563636557).

The spelling of 21320334245 in words is "twenty-one billion, three hundred twenty million, three hundred thirty-four thousand, two hundred forty-five".