120111201021221 has 4 divisors (see below), whose sum is σ = 120113532378444. Its totient is φ = 120108869664000.

The previous prime is 120111201021173. The next prime is 120111201021281. The reversal of 120111201021221 is 122120102111021.

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 37291845957025 + 82819355064196 = 6106705^2 + 9100514^2 .

It is a cyclic number.

It is not a de Polignac number, because 120111201021221 - 2¹⁰ = 120111201020197 is a prime.

It is a super-2 number, since 2×120111201021221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120111201021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120111201021281) 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, 1165601330 + ... + 1165704371.

It is an arithmetic number, because the mean of its divisors is an integer number (30028383094611).

Almost surely, 2^{120111201021221} is an apocalyptic number.

It is an amenable number.

120111201021221 is a deficient number, since it is larger than the sum of its proper divisors (2331357223).

120111201021221 is an equidigital number, since it uses as much as digits as its factorization.

120111201021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331357222.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 120111201021221 its reverse (122120102111021), we get a palindrome (242231303132242).

The spelling of 120111201021221 in words is "one hundred twenty trillion, one hundred eleven billion, two hundred one million, twenty-one thousand, two hundred twenty-one".