21203303224 has 8 divisors (see below), whose sum is σ = 39756193560. Its totient is φ = 10601651608.

The previous prime is 21203303221. The next prime is 21203303293. The reversal of 21203303224 is 42230330212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21203303195 and 21203303204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203303221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325206444 + ... + 1325206459.

It is an arithmetic number, because the mean of its divisors is an integer number (4969524195).

Almost surely, 2^21203303224 is an apocalyptic number.

It is an amenable number.

21203303224 is a deficient number, since it is larger than the sum of its proper divisors (18552890336).

21203303224 is a wasteful number, since it uses less digits than its factorization.

21203303224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650412909 (or 2650412905 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21203303224 its reverse (42230330212), we get a palindrome (63433633436).

The spelling of 21203303224 in words is "twenty-one billion, two hundred three million, three hundred three thousand, two hundred twenty-four".