21020450050 has 12 divisors (see below), whose sum is σ = 39098037186. Its totient is φ = 8408180000.

The previous prime is 21020450047. The next prime is 21020450051. The reversal of 21020450050 is 5005402012.

It can be written as a sum of positive squares in 3 ways, for example, as 18739145881 + 2281304169 = 136891^2 + 47763^2 .

It is not an unprimeable number, because it can be changed into a prime (21020450051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210204451 + ... + 210204550.

Almost surely, 2^21020450050 is an apocalyptic number.

21020450050 is a deficient number, since it is larger than the sum of its proper divisors (18077587136).

21020450050 is a wasteful number, since it uses less digits than its factorization.

21020450050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420409013 (or 420409008 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 21020450050 its reverse (5005402012), we get a palindrome (26025852062).

The spelling of 21020450050 in words is "twenty-one billion, twenty million, four hundred fifty thousand, fifty".