21500535315 has 24 divisors (see below), whose sum is σ = 40017324240. Its totient is φ = 9828815808.

The previous prime is 21500535293. The next prime is 21500535317. The reversal of 21500535315 is 51353500512.

It is not a de Polignac number, because 21500535315 - 2¹² = 21500531219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500535317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14625480 + ... + 14626949.

It is an arithmetic number, because the mean of its divisors is an integer number (1667388510).

Almost surely, 2^21500535315 is an apocalyptic number.

21500535315 is a deficient number, since it is larger than the sum of its proper divisors (18516788925).

21500535315 is a wasteful number, since it uses less digits than its factorization.

21500535315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29252451 (or 29252444 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 21500535315 in words is "twenty-one billion, five hundred million, five hundred thirty-five thousand, three hundred fifteen".