1220202212021 has 8 divisors (see below), whose sum is σ = 1321659668280. Its totient is φ = 1119829862592.

The previous prime is 1220202211997. The next prime is 1220202212027. The reversal of 1220202212021 is 1202122020221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 99123595921 + 1121078616100 = 314839^2 + 1058810^2 .

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 1220202212021 - 2¹⁴ = 1220202195637 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 (1220202212027) 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, 271274366 + ... + 271278863.

It is an arithmetic number, because the mean of its divisors is an integer number (165207458535).

Almost surely, 2^{1220202212021} is an apocalyptic number.

It is an amenable number.

1220202212021 is a deficient number, since it is larger than the sum of its proper divisors (101457456259).

1220202212021 is a wasteful number, since it uses less digits than its factorization.

1220202212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542553415.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220202212021 its reverse (1202122020221), we get a palindrome (2422324232242).

The spelling of 1220202212021 in words is "one trillion, two hundred twenty billion, two hundred two million, two hundred twelve thousand, twenty-one".