1011011116521 has 12 divisors (see below), whose sum is σ = 1568098874832. Its totient is φ = 577720637928.

The previous prime is 1011011116517. The next prime is 1011011116523. The reversal of 1011011116521 is 1256111101101.

It is not a de Polignac number, because 1011011116521 - 2² = 1011011116517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1011011116523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3438813175 + ... + 3438813468.

It is an arithmetic number, because the mean of its divisors is an integer number (130674906236).

Almost surely, 2^{1011011116521} is an apocalyptic number.

It is an amenable number.

1011011116521 is a deficient number, since it is larger than the sum of its proper divisors (557087758311).

1011011116521 is an equidigital number, since it uses as much as digits as its factorization.

1011011116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6877626660 (or 6877626653 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 21.

Adding to 1011011116521 its reverse (1256111101101), we get a palindrome (2267122217622).

The spelling of 1011011116521 in words is "one trillion, eleven billion, eleven million, one hundred sixteen thousand, five hundred twenty-one".