21523363215 has 32 divisors (see below), whose sum is σ = 34631236800. Its totient is φ = 11414667264.

The previous prime is 21523363193. The next prime is 21523363219. The reversal of 21523363215 is 51236332512.

It is not a de Polignac number, because 21523363215 - 2⁶ = 21523363151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523363219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2374011 + ... + 2383059.

It is an arithmetic number, because the mean of its divisors is an integer number (1082226150).

Almost surely, 2^21523363215 is an apocalyptic number.

21523363215 is a deficient number, since it is larger than the sum of its proper divisors (13107873585).

21523363215 is a wasteful number, since it uses less digits than its factorization.

21523363215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9931.

The product of its digits is 32400, while the sum is 33.

Adding to 21523363215 its reverse (51236332512), we get a palindrome (72759695727).

The spelling of 21523363215 in words is "twenty-one billion, five hundred twenty-three million, three hundred sixty-three thousand, two hundred fifteen".