21512360330344 has 16 divisors (see below), whose sum is σ = 43438419898020. Its totient is φ = 9928781690880.

The previous prime is 21512360330341. The next prime is 21512360330389. The reversal of 21512360330344 is 44303306321512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16674727240900 + 4837633089444 = 4083470^2 + 2199462^2 .

It is not an unprimeable number, because it can be changed into a prime (21512360330341) 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, 103424809177 + ... + 103424809384.

Almost surely, 2^{21512360330344} is an apocalyptic number.

It is an amenable number.

21512360330344 is an abundant number, since it is smaller than the sum of its proper divisors (21926059567676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21512360330344 is a wasteful number, since it uses less digits than its factorization.

21512360330344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206849618580 (or 206849618576 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 21512360330344 its reverse (44303306321512), we get a palindrome (65815666651856).

The spelling of 21512360330344 in words is "twenty-one trillion, five hundred twelve billion, three hundred sixty million, three hundred thirty thousand, three hundred forty-four".