21452261224 has 16 divisors (see below), whose sum is σ = 40592009700. Its totient is φ = 10627725312.

The previous prime is 21452261221. The next prime is 21452261251. The reversal of 21452261224 is 42216225412.

It can be written as a sum of positive squares in 2 ways, for example, as 19270437124 + 2181824100 = 138818^2 + 46710^2 .

It is not an unprimeable number, because it can be changed into a prime (21452261221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12299737 + ... + 12301480.

Almost surely, 2^21452261224 is an apocalyptic number.

It is an amenable number.

21452261224 is a deficient number, since it is larger than the sum of its proper divisors (19139748476).

21452261224 is a wasteful number, since it uses less digits than its factorization.

21452261224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24601332 (or 24601328 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

Adding to 21452261224 its reverse (42216225412), we get a palindrome (63668486636).

The spelling of 21452261224 in words is "twenty-one billion, four hundred fifty-two million, two hundred sixty-one thousand, two hundred twenty-four".