21505246696 has 16 divisors (see below), whose sum is σ = 40324875840. Its totient is φ = 10751946480.

The previous prime is 21505246673. The next prime is 21505246739. The reversal of 21505246696 is 69664250512.

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, 66241 + ... + 217711.

It is an arithmetic number, because the mean of its divisors is an integer number (2520304740).

Almost surely, 2^21505246696 is an apocalyptic number.

It is an amenable number.

21505246696 is a deficient number, since it is larger than the sum of its proper divisors (18819629144).

21505246696 is a wasteful number, since it uses less digits than its factorization.

21505246696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169224 (or 169220 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 21505246696 in words is "twenty-one billion, five hundred five million, two hundred forty-six thousand, six hundred ninety-six".