21031200224 has 12 divisors (see below), whose sum is σ = 41405175504. Its totient is φ = 10515600096.

The previous prime is 21031200221. The next prime is 21031200271. The reversal of 21031200224 is 42200213012.

It is a super-2 number, since 2×21031200224² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031200221) 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 as a sum of consecutive naturals, namely, 328612472 + ... + 328612535.

It is an arithmetic number, because the mean of its divisors is an integer number (3450431292).

Almost surely, 2^21031200224 is an apocalyptic number.

It is an amenable number.

21031200224 is a deficient number, since it is larger than the sum of its proper divisors (20373975280).

21031200224 is an equidigital number, since it uses as much as digits as its factorization.

21031200224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657225017 (or 657225009 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21031200224 its reverse (42200213012), we get a palindrome (63231413236).

The spelling of 21031200224 in words is "twenty-one billion, thirty-one million, two hundred thousand, two hundred twenty-four".