21011153224 has 16 divisors (see below), whose sum is σ = 39447153900. Its totient is φ = 10491912192.

The previous prime is 21011153201. The next prime is 21011153227. The reversal of 21011153224 is 42235111012.

It can be written as a sum of positive squares in 2 ways, for example, as 18168344100 + 2842809124 = 134790^2 + 53318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011153195 and 21011153204.

It is not an unprimeable number, because it can be changed into a prime (21011153227) 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, 1701517 + ... + 1713820.

Almost surely, 2^21011153224 is an apocalyptic number.

It is an amenable number.

21011153224 is a deficient number, since it is larger than the sum of its proper divisors (18436000676).

21011153224 is a wasteful number, since it uses less digits than its factorization.

21011153224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416112 (or 3416108 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21011153224 its reverse (42235111012), we get a palindrome (63246264236).

The spelling of 21011153224 in words is "twenty-one billion, eleven million, one hundred fifty-three thousand, two hundred twenty-four".