21512360330342 has 16 divisors (see below), whose sum is σ = 36891659973120. Its totient is φ = 9216251004168.

The previous prime is 21512360330341. The next prime is 21512360330389. The reversal of 21512360330342 is 24303306321512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512360330341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277626092 + ... + 277703567.

It is an arithmetic number, because the mean of its divisors is an integer number (2305728748320).

Almost surely, 2^{21512360330342} is an apocalyptic number.

21512360330342 is a deficient number, since it is larger than the sum of its proper divisors (15379299642778).

21512360330342 is a wasteful number, since it uses less digits than its factorization.

21512360330342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555332435.

The product of its (nonzero) digits is 77760, while the sum is 35.

Adding to 21512360330342 its reverse (24303306321512), we get a palindrome (45815666651854).

The spelling of 21512360330342 in words is "twenty-one trillion, five hundred twelve billion, three hundred sixty million, three hundred thirty thousand, three hundred forty-two".