21205473752 has 16 divisors (see below), whose sum is σ = 39764539440. Its totient is φ = 10601596576.

The previous prime is 21205473743. The next prime is 21205473767. The reversal of 21205473752 is 25737450212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60743 + ... + 214710.

It is an arithmetic number, because the mean of its divisors is an integer number (2485283715).

Almost surely, 2^21205473752 is an apocalyptic number.

It is an amenable number.

21205473752 is a deficient number, since it is larger than the sum of its proper divisors (18559065688).

21205473752 is a wasteful number, since it uses less digits than its factorization.

21205473752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285082 (or 285078 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 21205473752 in words is "twenty-one billion, two hundred five million, four hundred seventy-three thousand, seven hundred fifty-two".