21342323545 has 4 divisors (see below), whose sum is σ = 25610788260. Its totient is φ = 17073858832.

The previous prime is 21342323501. The next prime is 21342323627. The reversal of 21342323545 is 54532324312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13616089344 + 7726234201 = 116688^2 + 87899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342323545 - 2¹⁹ = 21341799257 is a prime.

It is a super-2 number, since 2×21342323545² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21342323545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134232350 + ... + 2134232359.

It is an arithmetic number, because the mean of its divisors is an integer number (6402697065).

Almost surely, 2^21342323545 is an apocalyptic number.

It is an amenable number.

21342323545 is a deficient number, since it is larger than the sum of its proper divisors (4268464715).

21342323545 is an equidigital number, since it uses as much as digits as its factorization.

21342323545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268464714.

The product of its digits is 86400, while the sum is 34.

Adding to 21342323545 its reverse (54532324312), we get a palindrome (75874647857).

The spelling of 21342323545 in words is "twenty-one billion, three hundred forty-two million, three hundred twenty-three thousand, five hundred forty-five".