21707515050 has 96 divisors (see below), whose sum is σ = 61386196032. Its totient is φ = 5029063680.

The previous prime is 21707515043. The next prime is 21707515061. The reversal of 21707515050 is 5051570712.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 294264 + ... + 360563.

It is an arithmetic number, because the mean of its divisors is an integer number (639439542).

Almost surely, 2^21707515050 is an apocalyptic number.

21707515050 is an abundant number, since it is smaller than the sum of its proper divisors (39678680982).

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

21707515050 is a wasteful number, since it uses less digits than its factorization.

21707515050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654872 (or 654867 counting only the distinct ones).

The product of its (nonzero) digits is 12250, while the sum is 33.

The spelling of 21707515050 in words is "twenty-one billion, seven hundred seven million, five hundred fifteen thousand, fifty".