1001222120121 has 16 divisors (see below), whose sum is σ = 1466320727040. Its totient is φ = 604857298320.

The previous prime is 1001222120089. The next prime is 1001222120131. The reversal of 1001222120121 is 1210212221001.

It is not a de Polignac number, because 1001222120121 - 2⁵ = 1001222120089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001222120121.

It is not an unprimeable number, because it can be changed into a prime (1001222120131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381853045 + ... + 381855666.

It is an arithmetic number, because the mean of its divisors is an integer number (91645045440).

Almost surely, 2^{1001222120121} is an apocalyptic number.

It is an amenable number.

1001222120121 is a deficient number, since it is larger than the sum of its proper divisors (465098606919).

1001222120121 is a wasteful number, since it uses less digits than its factorization.

1001222120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763708756.

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

Adding to 1001222120121 its reverse (1210212221001), we get a palindrome (2211434341122).

The spelling of 1001222120121 in words is "one trillion, one billion, two hundred twenty-two million, one hundred twenty thousand, one hundred twenty-one".