21703705506 has 48 divisors (see below), whose sum is σ = 54023943168. Its totient is φ = 6168585600.

The previous prime is 21703705489. The next prime is 21703705559. The reversal of 21703705506 is 60550730712.

21703705506 is a `hidden beast` number, since 2 + 1 + 70 + 37 + 0 + 550 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426855 + ... + 474986.

It is an arithmetic number, because the mean of its divisors is an integer number (1125498816).

Almost surely, 2^21703705506 is an apocalyptic number.

21703705506 is an abundant number, since it is smaller than the sum of its proper divisors (32320237662).

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

21703705506 is a wasteful number, since it uses less digits than its factorization.

21703705506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902047 (or 902044 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The spelling of 21703705506 in words is "twenty-one billion, seven hundred three million, seven hundred five thousand, five hundred six".