1055611721011 has 4 divisors (see below), whose sum is σ = 1055761609032. Its totient is φ = 1055461832992.

The previous prime is 1055611720991. The next prime is 1055611721039. The reversal of 1055611721011 is 1101271165501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1055611721011 - 2⁷ = 1055611720883 is a prime.

It is a super-2 number, since 2×1055611721011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1055611781011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74933446 + ... + 74947531.

It is an arithmetic number, because the mean of its divisors is an integer number (263940402258).

Almost surely, 2^{1055611721011} is an apocalyptic number.

1055611721011 is a deficient number, since it is larger than the sum of its proper divisors (149888021).

1055611721011 is an equidigital number, since it uses as much as digits as its factorization.

1055611721011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149888020.

The product of its (nonzero) digits is 2100, while the sum is 31.

Adding to 1055611721011 its reverse (1101271165501), we get a palindrome (2156882886512).

The spelling of 1055611721011 in words is "one trillion, fifty-five billion, six hundred eleven million, seven hundred twenty-one thousand, eleven".