11056477721 has 2 divisors, whose sum is σ = 11056477722. Its totient is φ = 11056477720.

The previous prime is 11056477717. The next prime is 11056477723. The reversal of 11056477721 is 12777465011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10387686400 + 668791321 = 101920^2 + 25861^2 .

It is a cyclic number.

It is not a de Polignac number, because 11056477721 - 2² = 11056477717 is a prime.

Together with 11056477723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11056477723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5528238860 + 5528238861.

It is an arithmetic number, because the mean of its divisors is an integer number (5528238861).

Almost surely, 2^11056477721 is an apocalyptic number.

It is an amenable number.

11056477721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11056477721 is an equidigital number, since it uses as much as digits as its factorization.

11056477721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 41.

The spelling of 11056477721 in words is "eleven billion, fifty-six million, four hundred seventy-seven thousand, seven hundred twenty-one".