1001221220122 has 4 divisors (see below), whose sum is σ = 1501831830186. Its totient is φ = 500610610060.

The previous prime is 1001221220107. The next prime is 1001221220123. The reversal of 1001221220122 is 2210221221001.

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., 689981083801 + 311240136321 = 830651^2 + 557889^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1001221220096 and 1001221220105.

It is not an unprimeable number, because it can be changed into a prime (1001221220123) by changing a digit.

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, 250305305029 + ... + 250305305032.

Almost surely, 2^{1001221220122} is an apocalyptic number.

1001221220122 is a deficient number, since it is larger than the sum of its proper divisors (500610610064).

1001221220122 is an equidigital number, since it uses as much as digits as its factorization.

1001221220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500610610063.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1001221220122 its reverse (2210221221001), we get a palindrome (3211442441123).

The spelling of 1001221220122 in words is "one trillion, one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".