21224250041 has 2 divisors, whose sum is σ = 21224250042. Its totient is φ = 21224250040.

The previous prime is 21224250031. The next prime is 21224250043. The reversal of 21224250041 is 14005242212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18604960000 + 2619290041 = 136400^2 + 51179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224250041 is a prime.

Together with 21224250043, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21224249989 and 21224250016.

It is not a weakly prime, because it can be changed into another prime (21224250043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612125020 + 10612125021.

It is an arithmetic number, because the mean of its divisors is an integer number (10612125021).

Almost surely, 2^21224250041 is an apocalyptic number.

It is an amenable number.

21224250041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224250041 is an equidigital number, since it uses as much as digits as its factorization.

21224250041 is an evil number, because the sum of its binary digits is even.

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

Adding to 21224250041 its reverse (14005242212), we get a palindrome (35229492253).

The spelling of 21224250041 in words is "twenty-one billion, two hundred twenty-four million, two hundred fifty thousand, forty-one".