21563350450 has 36 divisors (see below), whose sum is σ = 41443460730. Its totient is φ = 8347084800.

The previous prime is 21563350441. The next prime is 21563350469. The reversal of 21563350450 is 5405336512.

It can be written as a sum of positive squares in 3 ways, for example, as 8357433561 + 13205916889 = 91419^2 + 114917^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 176335 + ... + 272434.

Almost surely, 2^21563350450 is an apocalyptic number.

21563350450 is a deficient number, since it is larger than the sum of its proper divisors (19880110280).

21563350450 is a wasteful number, since it uses less digits than its factorization.

21563350450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448843 (or 448807 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 21563350450 its reverse (5405336512), we get a palindrome (26968686962).

The spelling of 21563350450 in words is "twenty-one billion, five hundred sixty-three million, three hundred fifty thousand, four hundred fifty".