1021220221202 has 4 divisors (see below), whose sum is σ = 1531830331806. Its totient is φ = 510610110600.

The previous prime is 1021220221169. The next prime is 1021220221213. The reversal of 1021220221202 is 2021220221201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 730493286721 + 290726934481 = 854689^2 + 539191^2 .

It is a super-3 number, since 3×1021220221202³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255305055299 + ... + 255305055302.

Almost surely, 2^{1021220221202} is an apocalyptic number.

1021220221202 is a deficient number, since it is larger than the sum of its proper divisors (510610110604).

1021220221202 is an equidigital number, since it uses as much as digits as its factorization.

1021220221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510610110603.

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

Adding to 1021220221202 its reverse (2021220221201), we get a palindrome (3042440442403).

Subtracting 1021220221202 from its reverse (2021220221201), we obtain a palindrome (999999999999).

The spelling of 1021220221202 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred two".