11211055551481 has 2 divisors, whose sum is σ = 11211055551482. Its totient is φ = 11211055551480.

The previous prime is 11211055551457. The next prime is 11211055551491. The reversal of 11211055551481 is 18415555011211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10876672080400 + 334383471081 = 3297980^2 + 578259^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211055551481 - 2⁹ = 11211055550969 is a prime.

It is a super-2 number, since 2×11211055551481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11211055551491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605527775740 + 5605527775741.

It is an arithmetic number, because the mean of its divisors is an integer number (5605527775741).

Almost surely, 2^{11211055551481} is an apocalyptic number.

It is an amenable number.

11211055551481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211055551481 is an equidigital number, since it uses as much as digits as its factorization.

11211055551481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40000, while the sum is 40.

The spelling of 11211055551481 in words is "eleven trillion, two hundred eleven billion, fifty-five million, five hundred fifty-one thousand, four hundred eighty-one".