21118887050 has 12 divisors (see below), whose sum is σ = 39281130006. Its totient is φ = 8447554800.

The previous prime is 21118887037. The next prime is 21118887067. The reversal of 21118887050 is 5078881112.

It can be written as a sum of positive squares in 3 ways, for example, as 13130638921 + 7988248129 = 114589^2 + 89377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21118886989 and 21118887007.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211188821 + ... + 211188920.

Almost surely, 2^21118887050 is an apocalyptic number.

21118887050 is a deficient number, since it is larger than the sum of its proper divisors (18162242956).

21118887050 is a wasteful number, since it uses less digits than its factorization.

21118887050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422377753 (or 422377748 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 41.

The spelling of 21118887050 in words is "twenty-one billion, one hundred eighteen million, eight hundred eighty-seven thousand, fifty".