21001241224 has 32 divisors (see below), whose sum is σ = 39535672320. Its totient is φ = 10458475456.

The previous prime is 21001241213. The next prime is 21001241243. The reversal of 21001241224 is 42214210012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2364039 + ... + 2372905.

It is an arithmetic number, because the mean of its divisors is an integer number (1235489760).

Almost surely, 2^21001241224 is an apocalyptic number.

It is an amenable number.

21001241224 is a deficient number, since it is larger than the sum of its proper divisors (18534431096).

21001241224 is a wasteful number, since it uses less digits than its factorization.

21001241224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029 (or 10025 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21001241224 its reverse (42214210012), we get a palindrome (63215451236).

The spelling of 21001241224 in words is "twenty-one billion, one million, two hundred forty-one thousand, two hundred twenty-four".