1021222120202 has 4 divisors (see below), whose sum is σ = 1531833180306. Its totient is φ = 510611060100.

The previous prime is 1021222120159. The next prime is 1021222120207. The reversal of 1021222120202 is 2020212221201.

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., 973693324081 + 47528796121 = 986759^2 + 218011^2 .

It is not an unprimeable number, because it can be changed into a prime (1021222120207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255305530049 + ... + 255305530052.

Almost surely, 2^{1021222120202} is an apocalyptic number.

1021222120202 is a deficient number, since it is larger than the sum of its proper divisors (510611060104).

1021222120202 is an equidigital number, since it uses as much as digits as its factorization.

1021222120202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510611060103.

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

Adding to 1021222120202 its reverse (2020212221201), we get a palindrome (3041434341403).

The spelling of 1021222120202 in words is "one trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred two".