21423528315344 has 20 divisors (see below), whose sum is σ = 41974469103780. Its totient is φ = 10591407256320.

The previous prime is 21423528315331. The next prime is 21423528315349. The reversal of 21423528315344 is 44351382532412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3452609934400 + 17970918380944 = 1858120^2 + 4239212^2 .

It is a super-2 number, since 2×21423528315344² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423528315349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7522304867 + ... + 7522307714.

It is an arithmetic number, because the mean of its divisors is an integer number (2098723455189).

Almost surely, 2^{21423528315344} is an apocalyptic number.

It is an amenable number.

21423528315344 is a deficient number, since it is larger than the sum of its proper divisors (20550940788436).

21423528315344 is a wasteful number, since it uses less digits than its factorization.

21423528315344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15044612678 (or 15044612672 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 47.

The spelling of 21423528315344 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred twenty-eight million, three hundred fifteen thousand, three hundred forty-four".