21224040353 has 16 divisors (see below), whose sum is σ = 22069440000. Its totient is φ = 20389155840.

The previous prime is 21224040317. The next prime is 21224040373. The reversal of 21224040353 is 35304042212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224040353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21224040373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2981963 + ... + 2989071.

It is an arithmetic number, because the mean of its divisors is an integer number (1379340000).

Almost surely, 2^21224040353 is an apocalyptic number.

It is an amenable number.

21224040353 is a deficient number, since it is larger than the sum of its proper divisors (845399647).

21224040353 is a wasteful number, since it uses less digits than its factorization.

21224040353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21224040353 its reverse (35304042212), we get a palindrome (56528082565).

The spelling of 21224040353 in words is "twenty-one billion, two hundred twenty-four million, forty thousand, three hundred fifty-three".