21024444550 has 12 divisors (see below), whose sum is σ = 39105466956. Its totient is φ = 8409777800.

The previous prime is 21024444523. The next prime is 21024444557. The reversal of 21024444550 is 5544442012.

It is a super-3 number, since 3×21024444550³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024444557) 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, 210244396 + ... + 210244495.

It is an arithmetic number, because the mean of its divisors is an integer number (3258788913).

Almost surely, 2^21024444550 is an apocalyptic number.

21024444550 is a deficient number, since it is larger than the sum of its proper divisors (18081022406).

21024444550 is a wasteful number, since it uses less digits than its factorization.

21024444550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420488903 (or 420488898 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 21024444550 its reverse (5544442012), we get a palindrome (26568886562).

The spelling of 21024444550 in words is "twenty-one billion, twenty-four million, four hundred forty-four thousand, five hundred fifty".