21535013512 has 32 divisors (see below), whose sum is σ = 41480381880. Its totient is φ = 10475069440.

The previous prime is 21535013473. The next prime is 21535013557. The reversal of 21535013512 is 21531053512.

It can be written as a sum of positive squares in 4 ways, for example, as 17420304196 + 4114709316 = 131986^2 + 64146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22788 + ... + 208780.

Almost surely, 2^21535013512 is an apocalyptic number.

It is an amenable number.

21535013512 is a deficient number, since it is larger than the sum of its proper divisors (19945368368).

21535013512 is a wasteful number, since it uses less digits than its factorization.

21535013512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186393 (or 186389 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 21535013512 in words is "twenty-one billion, five hundred thirty-five million, thirteen thousand, five hundred twelve".