1020120011221 has 4 divisors (see below), whose sum is σ = 1020129578892. Its totient is φ = 1020110443552.

The previous prime is 1020120011159. The next prime is 1020120011243. The reversal of 1020120011221 is 1221100210201.

1020120011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 421220470225 + 598899540996 = 649015^2 + 773886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020120011221 - 2⁹ = 1020120010709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020120041221) 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, 4622080 + ... + 4837753.

It is an arithmetic number, because the mean of its divisors is an integer number (255032394723).

Almost surely, 2^{1020120011221} is an apocalyptic number.

It is an amenable number.

1020120011221 is a deficient number, since it is larger than the sum of its proper divisors (9567671).

1020120011221 is an equidigital number, since it uses as much as digits as its factorization.

1020120011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9567670.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1020120011221 its reverse (1221100210201), we get a palindrome (2241220221422).

The spelling of 1020120011221 in words is "one trillion, twenty billion, one hundred twenty million, eleven thousand, two hundred twenty-one".