21550060450 has 24 divisors (see below), whose sum is σ = 41825858688. Its totient is φ = 8245240080.

The previous prime is 21550060447. The next prime is 21550060459. The reversal of 21550060450 is 5406005512.

It is not an unprimeable number, because it can be changed into a prime (21550060459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9368442 + ... + 9370741.

It is an arithmetic number, because the mean of its divisors is an integer number (1742744112).

Almost surely, 2^21550060450 is an apocalyptic number.

21550060450 is a deficient number, since it is larger than the sum of its proper divisors (20275798238).

21550060450 is a wasteful number, since it uses less digits than its factorization.

21550060450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18739218 (or 18739213 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21550060450 its reverse (5406005512), we get a palindrome (26956065962).

The spelling of 21550060450 in words is "twenty-one billion, five hundred fifty million, sixty thousand, four hundred fifty".