21353524512 has 48 divisors (see below), whose sum is σ = 56074540032. Its totient is φ = 7115106560.

The previous prime is 21353524487. The next prime is 21353524529. The reversal of 21353524512 is 21542535312.

It is a tau number, because it is divible by the number of its divisors (48).

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, 216562 + ... + 299342.

It is an arithmetic number, because the mean of its divisors is an integer number (1168219584).

Almost surely, 2^21353524512 is an apocalyptic number.

It is an amenable number.

21353524512 is an abundant number, since it is smaller than the sum of its proper divisors (34721015520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21353524512 is a wasteful number, since it uses less digits than its factorization.

21353524512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85481 (or 85473 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The spelling of 21353524512 in words is "twenty-one billion, three hundred fifty-three million, five hundred twenty-four thousand, five hundred twelve".