21906786050 has 24 divisors (see below), whose sum is σ = 40753344000. Its totient is φ = 8761268880.

The previous prime is 21906786047. The next prime is 21906786061. The reversal of 21906786050 is 5068760912.

It is a junction number, because it is equal to n+sod(n) for n = 21906785992 and 21906786010.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301151 + ... + 366749.

It is an arithmetic number, because the mean of its divisors is an integer number (1698056000).

Almost surely, 2^21906786050 is an apocalyptic number.

21906786050 is a deficient number, since it is larger than the sum of its proper divisors (18846557950).

21906786050 is a wasteful number, since it uses less digits than its factorization.

21906786050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72290 (or 72285 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 21906786050 in words is "twenty-one billion, nine hundred six million, seven hundred eighty-six thousand, fifty".