1012202220221 has 6 divisors (see below), whose sum is σ = 1012786978266. Its totient is φ = 1011617799600.

The previous prime is 1012202220193. The next prime is 1012202220233. The reversal of 1012202220221 is 1220222022101.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 163426956121 + 848775264100 = 404261^2 + 921290^2 .

It is not a de Polignac number, because 1012202220221 - 2²⁶ = 1012135111357 is a prime.

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 1012202220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012202220251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2864111 + ... + 3198051.

It is an arithmetic number, because the mean of its divisors is an integer number (168797829711).

Almost surely, 2^{1012202220221} is an apocalyptic number.

It is an amenable number.

1012202220221 is a deficient number, since it is larger than the sum of its proper divisors (584758045).

1012202220221 is an frugal number, since it uses more digits than its factorization.

1012202220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337423 (or 335682 counting only the distinct ones).

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

Adding to 1012202220221 its reverse (1220222022101), we get a palindrome (2232424242322).

The spelling of 1012202220221 in words is "one trillion, twelve billion, two hundred two million, two hundred twenty thousand, two hundred twenty-one".