1011110221021 has 4 divisors (see below), whose sum is σ = 1016242760412. Its totient is φ = 1005977681632.

The previous prime is 1011110221019. The next prime is 1011110221111. The reversal of 1011110221021 is 1201220111101.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 646552687225 + 364557533796 = 804085^2 + 603786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011110221021 - 2¹ = 1011110221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011110220992 and 1011110221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011110221001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2566269400 + ... + 2566269793.

It is an arithmetic number, because the mean of its divisors is an integer number (254060690103).

Almost surely, 2^{1011110221021} is an apocalyptic number.

It is an amenable number.

1011110221021 is a deficient number, since it is larger than the sum of its proper divisors (5132539391).

1011110221021 is an equidigital number, since it uses as much as digits as its factorization.

1011110221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132539390.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011110221021 its reverse (1201220111101), we get a palindrome (2212330332122).

The spelling of 1011110221021 in words is "one trillion, eleven billion, one hundred ten million, two hundred twenty-one thousand, twenty-one".