21956546011 has 2 divisors, whose sum is σ = 21956546012. Its totient is φ = 21956546010.

The previous prime is 21956545979. The next prime is 21956546041. The reversal of 21956546011 is 11064565912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21956546011 - 2⁵ = 21956545979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21956546041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10978273005 + 10978273006.

It is an arithmetic number, because the mean of its divisors is an integer number (10978273006).

Almost surely, 2^21956546011 is an apocalyptic number.

21956546011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21956546011 is an equidigital number, since it uses as much as digits as its factorization.

21956546011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 21956546011 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, eleven".