21671072050 has 24 divisors (see below), whose sum is σ = 41397608196. Its totient is φ = 8434146240.

The previous prime is 21671072039. The next prime is 21671072051. The reversal of 21671072050 is 5027017612.

It can be written as a sum of positive squares in 6 ways, for example, as 13268966481 + 8402105569 = 115191^2 + 91663^2 .

It is not an unprimeable number, because it can be changed into a prime (21671072051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5855197 + ... + 5858896.

Almost surely, 2^21671072050 is an apocalyptic number.

21671072050 is a deficient number, since it is larger than the sum of its proper divisors (19726536146).

21671072050 is a wasteful number, since it uses less digits than its factorization.

21671072050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11714142 (or 11714137 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

Adding to 21671072050 its reverse (5027017612), we get a palindrome (26698089662).

The spelling of 21671072050 in words is "twenty-one billion, six hundred seventy-one million, seventy-two thousand, fifty".