1001222121021 has 8 divisors (see below), whose sum is σ = 1338809984544. Its totient is φ = 665557835760.

The previous prime is 1001222121019. The next prime is 1001222121037. The reversal of 1001222121021 is 1201212221001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1001222121021 - 2¹ = 1001222121019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222121001) 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 in 7 ways as a sum of consecutive naturals, for example, 480893350 + ... + 480895431.

It is an arithmetic number, because the mean of its divisors is an integer number (167351248068).

Almost surely, 2^{1001222121021} is an apocalyptic number.

It is an amenable number.

1001222121021 is a deficient number, since it is larger than the sum of its proper divisors (337587863523).

1001222121021 is an equidigital number, since it uses as much as digits as its factorization.

1001222121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961789131.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001222121021 its reverse (1201212221001), we get a palindrome (2202434342022).

The spelling of 1001222121021 in words is "one trillion, one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".