1021221202 has 4 divisors (see below), whose sum is σ = 1531831806. Its totient is φ = 510610600.

The previous prime is 1021221197. The next prime is 1021221203. The reversal of 1021221202 is 2021221201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2021221201 = 26717 ⋅75653.

It can be written as a sum of positive squares in only one way, i.e., 1020099721 + 1121481 = 31939^2 + 1059^2 .

It is not an unprimeable number, because it can be changed into a prime (1021221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255305299 + ... + 255305302.

Almost surely, 2^1021221202 is an apocalyptic number.

1021221202 is a deficient number, since it is larger than the sum of its proper divisors (510610604).

1021221202 is an equidigital number, since it uses as much as digits as its factorization.

1021221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510610603.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1021221202 is about 31956.5517851974. The cubic root of 1021221202 is about 1007.0242779916.

Adding to 1021221202 its reverse (2021221201), we get a palindrome (3042442403).

Subtracting 1021221202 from its reverse (2021221201), we obtain a palindrome (999999999).

The spelling of 1021221202 in words is "one billion, twenty-one million, two hundred twenty-one thousand, two hundred two".