1001222121011 has 16 divisors (see below), whose sum is σ = 1212492916224. Its totient is φ = 807088593024.

The previous prime is 1001222121001. The next prime is 1001222121019. The reversal of 1001222121011 is 1101212221001.

It is not a de Polignac number, because 1001222121011 - 2⁶ = 1001222120947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001222121019) 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, 3073505 + ... + 3383618.

It is an arithmetic number, because the mean of its divisors is an integer number (75780807264).

Almost surely, 2^{1001222121011} is an apocalyptic number.

1001222121011 is a deficient number, since it is larger than the sum of its proper divisors (211270795213).

1001222121011 is a wasteful number, since it uses less digits than its factorization.

1001222121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458450.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001222121011 its reverse (1101212221001), we get a palindrome (2102434342012).

The spelling of 1001222121011 in words is "one trillion, one billion, two hundred twenty-two million, one hundred twenty-one thousand, eleven".