21011040650 has 24 divisors (see below), whose sum is σ = 39630972384. Its totient is φ = 8286042800.

The previous prime is 21011040649. The next prime is 21011040667. The reversal of 21011040650 is 5604011012.

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, 2955752 + ... + 2962851.

It is an arithmetic number, because the mean of its divisors is an integer number (1651290516).

Almost surely, 2^21011040650 is an apocalyptic number.

21011040650 is a deficient number, since it is larger than the sum of its proper divisors (18619931734).

21011040650 is a wasteful number, since it uses less digits than its factorization.

21011040650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918686 (or 5918681 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21011040650 its reverse (5604011012), we get a palindrome (26615051662).

The spelling of 21011040650 in words is "twenty-one billion, eleven million, forty thousand, six hundred fifty".