21224104050431 has 4 divisors (see below), whose sum is σ = 21224746517832. Its totient is φ = 21223461583032.

The previous prime is 21224104050403. The next prime is 21224104050449. The reversal of 21224104050431 is 13405040142212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21224104050431 - 2³⁰ = 21223030308607 is a prime.

It is a super-2 number, since 2×21224104050431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21224104050394 and 21224104050403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224104050481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321184145 + ... + 321250218.

It is an arithmetic number, because the mean of its divisors is an integer number (5306186629458).

Almost surely, 2^{21224104050431} is an apocalyptic number.

21224104050431 is a deficient number, since it is larger than the sum of its proper divisors (642467401).

21224104050431 is an equidigital number, since it uses as much as digits as its factorization.

21224104050431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642467400.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21224104050431 its reverse (13405040142212), we get a palindrome (34629144192643).

The spelling of 21224104050431 in words is "twenty-one trillion, two hundred twenty-four billion, one hundred four million, fifty thousand, four hundred thirty-one".