1011012221221 has 4 divisors (see below), whose sum is σ = 1012717132812. Its totient is φ = 1009307309632.

The previous prime is 1011012221209. The next prime is 1011012221237. The reversal of 1011012221221 is 1221222101101.

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 384517809025 + 626494412196 = 620095^2 + 791514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011012221221 - 2¹⁷ = 1011012090149 is a prime.

It is a super-2 number, since 2×1011012221221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011012221195 and 1011012221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011012227221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852454906 + ... + 852456091.

It is an arithmetic number, because the mean of its divisors is an integer number (253179283203).

Almost surely, 2^{1011012221221} is an apocalyptic number.

It is an amenable number.

1011012221221 is a deficient number, since it is larger than the sum of its proper divisors (1704911591).

1011012221221 is an equidigital number, since it uses as much as digits as its factorization.

1011012221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704911590.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1011012221221 its reverse (1221222101101), we get a palindrome (2232234322322).

The spelling of 1011012221221 in words is "one trillion, eleven billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".