21234041323515 has 192 divisors, whose sum is σ = 39717407987712. Its totient is φ = 10875382963200.

The previous prime is 21234041323513. The next prime is 21234041323577. The reversal of 21234041323515 is 51532314043212.

21234041323515 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 4 + 0 + 4 + 132 + 3 + 515 = 666.

It is not a de Polignac number, because 21234041323515 - 2¹ = 21234041323513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234041323515.

It is not an unprimeable number, because it can be changed into a prime (21234041323513) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 856855425 + ... + 856880205.

It is an arithmetic number, because the mean of its divisors is an integer number (206861499936).

Almost surely, 2^{21234041323515} is an apocalyptic number.

21234041323515 is a deficient number, since it is larger than the sum of its proper divisors (18483366664197).

21234041323515 is a wasteful number, since it uses less digits than its factorization.

21234041323515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25112 (or 25100 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21234041323515 its reverse (51532314043212), we get a palindrome (72766355366727).

The spelling of 21234041323515 in words is "twenty-one trillion, two hundred thirty-four billion, forty-one million, three hundred twenty-three thousand, five hundred fifteen".