21040534512 has 40 divisors (see below), whose sum is σ = 60394128080. Its totient is φ = 7013511360.

The previous prime is 21040534421. The next prime is 21040534523. The reversal of 21040534512 is 21543504012.

21040534512 is a `hidden beast` number, since 210 + 405 + 3 + 45 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24352039 + ... + 24352902.

It is an arithmetic number, because the mean of its divisors is an integer number (1509853202).

Almost surely, 2^21040534512 is an apocalyptic number.

It is an amenable number.

21040534512 is an abundant number, since it is smaller than the sum of its proper divisors (39353593568).

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

21040534512 is a wasteful number, since it uses less digits than its factorization.

21040534512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48704958 (or 48704946 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21040534512 in words is "twenty-one billion, forty million, five hundred thirty-four thousand, five hundred twelve".