21956546041 has 2 divisors, whose sum is σ = 21956546042. Its totient is φ = 21956546040.

The previous prime is 21956546011. The next prime is 21956546047. The reversal of 21956546041 is 14064565912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20841253225 + 1115292816 = 144365^2 + 33396^2 .

It is a cyclic number.

It is not a de Polignac number, because 21956546041 - 2⁹ = 21956545529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21956546047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10978273020 + 10978273021.

It is an arithmetic number, because the mean of its divisors is an integer number (10978273021).

Almost surely, 2^21956546041 is an apocalyptic number.

It is an amenable number.

21956546041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21956546041 is an equidigital number, since it uses as much as digits as its factorization.

21956546041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21956546041 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, forty-one".