1011200220221 has 4 divisors (see below), whose sum is σ = 1011202657500. Its totient is φ = 1011197782944.

The previous prime is 1011200220169. The next prime is 1011200220229. The reversal of 1011200220221 is 1220220021101.

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 513208900996 + 497991319225 = 716386^2 + 705685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011200220221 - 2⁶ = 1011200220157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011200220196 and 1011200220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011200220229) 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, 423266 + ... + 1483763.

It is an arithmetic number, because the mean of its divisors is an integer number (252800664375).

Almost surely, 2^{1011200220221} is an apocalyptic number.

It is an amenable number.

1011200220221 is a deficient number, since it is larger than the sum of its proper divisors (2437279).

1011200220221 is an equidigital number, since it uses as much as digits as its factorization.

1011200220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437278.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1011200220221 its reverse (1220220021101), we get a palindrome (2231420241322).

The spelling of 1011200220221 in words is "one trillion, eleven billion, two hundred million, two hundred twenty thousand, two hundred twenty-one".