21345300345 has 16 divisors (see below), whose sum is σ = 34172229312. Its totient is φ = 11377577280.

The previous prime is 21345300329. The next prime is 21345300349. The reversal of 21345300345 is 54300354312.

It is not a de Polignac number, because 21345300345 - 2⁴ = 21345300329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21345300349) 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, 384571 + ... + 436560.

It is an arithmetic number, because the mean of its divisors is an integer number (2135764332).

Almost surely, 2^21345300345 is an apocalyptic number.

It is an amenable number.

21345300345 is a deficient number, since it is larger than the sum of its proper divisors (12826928967).

21345300345 is a wasteful number, since it uses less digits than its factorization.

21345300345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822872.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 21345300345 its reverse (54300354312), we get a palindrome (75645654657).

The spelling of 21345300345 in words is "twenty-one billion, three hundred forty-five million, three hundred thousand, three hundred forty-five".