21250014224 has 10 divisors (see below), whose sum is σ = 41171902590. Its totient is φ = 10625007104.

The previous prime is 21250014193. The next prime is 21250014239. The reversal of 21250014224 is 42241005212.

It can be written as a sum of positive squares in only one way, i.e., 18106393600 + 3143620624 = 134560^2 + 56068^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21250014224.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664062929 + ... + 664062960.

It is an arithmetic number, because the mean of its divisors is an integer number (4117190259).

Almost surely, 2^21250014224 is an apocalyptic number.

It is an amenable number.

21250014224 is a deficient number, since it is larger than the sum of its proper divisors (19921888366).

21250014224 is a wasteful number, since it uses less digits than its factorization.

21250014224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328125897 (or 1328125891 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21250014224 its reverse (42241005212), we get a palindrome (63491019436).

The spelling of 21250014224 in words is "twenty-one billion, two hundred fifty million, fourteen thousand, two hundred twenty-four".