1201022220121 has 8 divisors (see below), whose sum is σ = 1236560709384. Its totient is φ = 1165781124480.

The previous prime is 1201022220119. The next prime is 1201022220149. The reversal of 1201022220121 is 1210222201021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35995575625 + 1165026644496 = 189725^2 + 1079364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201022220121 - 2¹ = 1201022220119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201022220095 and 1201022220104.

It is not an unprimeable number, because it can be changed into a prime (1201022220221) 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 7 ways as a sum of consecutive naturals, for example, 74340210 + ... + 74356363.

It is an arithmetic number, because the mean of its divisors is an integer number (154570088673).

Almost surely, 2^{1201022220121} is an apocalyptic number.

It is an amenable number.

1201022220121 is a deficient number, since it is larger than the sum of its proper divisors (35538489263).

1201022220121 is a wasteful number, since it uses less digits than its factorization.

1201022220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148696811.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1201022220121 its reverse (1210222201021), we get a palindrome (2411244421142).

The spelling of 1201022220121 in words is "one trillion, two hundred one billion, twenty-two million, two hundred twenty thousand, one hundred twenty-one".