21224202512 has 20 divisors (see below), whose sum is σ = 41146177116. Its totient is φ = 10605834240.

The previous prime is 21224202497. The next prime is 21224202523. The reversal of 21224202512 is 21520242212.

It can be written as a sum of positive squares in 2 ways, for example, as 20948509696 + 275692816 = 144736^2 + 16604^2 .

It is a super-2 number, since 2×21224202512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363689 + ... + 417992.

Almost surely, 2^21224202512 is an apocalyptic number.

It is an amenable number.

21224202512 is a deficient number, since it is larger than the sum of its proper divisors (19921974604).

21224202512 is a wasteful number, since it uses less digits than its factorization.

21224202512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783386 (or 783380 counting only the distinct ones).

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

Adding to 21224202512 its reverse (21520242212), we get a palindrome (42744444724).

The spelling of 21224202512 in words is "twenty-one billion, two hundred twenty-four million, two hundred two thousand, five hundred twelve".