21071755752 has 32 divisors (see below), whose sum is σ = 52722257280. Its totient is φ = 7018202880.

The previous prime is 21071755729. The next prime is 21071755769. The reversal of 21071755752 is 25755717012.

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, 327073 + ... + 386160.

It is an arithmetic number, because the mean of its divisors is an integer number (1647570540).

Almost surely, 2^21071755752 is an apocalyptic number.

It is an amenable number.

21071755752 is an abundant number, since it is smaller than the sum of its proper divisors (31650501528).

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

21071755752 is a wasteful number, since it uses less digits than its factorization.

21071755752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714473 (or 714469 counting only the distinct ones).

The product of its (nonzero) digits is 171500, while the sum is 42.

The spelling of 21071755752 in words is "twenty-one billion, seventy-one million, seven hundred fifty-five thousand, seven hundred fifty-two".