1001222212121 has 4 divisors (see below), whose sum is σ = 1044753612672. Its totient is φ = 957690811572.

The previous prime is 1001222212051. The next prime is 1001222212129. The reversal of 1001222212121 is 1212122221001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001222212121 - 2¹⁴ = 1001222195737 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 1001222212121.

It is not an unprimeable number, because it can be changed into a prime (1001222212129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21765700241 + ... + 21765700286.

It is an arithmetic number, because the mean of its divisors is an integer number (261188403168).

Almost surely, 2^{1001222212121} is an apocalyptic number.

It is an amenable number.

1001222212121 is a deficient number, since it is larger than the sum of its proper divisors (43531400551).

1001222212121 is an equidigital number, since it uses as much as digits as its factorization.

1001222212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43531400550.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1001222212121 its reverse (1212122221001), we get a palindrome (2213344433122).

The spelling of 1001222212121 in words is "one trillion, one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".